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"nightly news" beginnings now. >> announcer: this is "nbc nightly news" with lester holt. good evening. a training exercise turned deadly for police officers inside a richmond, virginia greyhound bus station today when a man suddenly opened fire for no apparent reason, shooting a state trooper at close range, sending civilians running in panic from the building. tonight the gunman is dead and at least two other people are being treated for injuries after a bizarre and tragic turn of events. nbc justice correspondent pete williams has late details. >> reporter: the urgent call went out around 2:30 this afternoon. gunfire at the richmond, virginia greyhound bus station. >> we have an active shooting, 2910 north boulevard. they are still actively shooting. >> reporter: witnesses reported a panic to get away from the gunshots. others were just about to go inside. >> i had my hand on the door handle when i heard two gunshots go off. i didn't think they were gunshots. then there were like five, maybe ten more after that. i could see the muzzle flash through the tinted door. so i ran out of there. >> reporter: officials say state police were conducting a counterdrug training mission at the bus terminal which included talking to people in the bus station. they say an officer in uniform approached one man, who pulled a gun, shooting at close range. the wounded trooper was rushed to the hospital. the gunman was killed by police and two bystanders were hurt. >> one trooper is being treated for life-threatening injuries. two civilians being treated for nonlife-threatening injuries. >> reporter: the shooting happened in downtown richmond, about four miles from the state capitol building. federal agents are on the scene to help map out how it happened. tonight officials say the gunman did not go to the bus station to target police and did not pull a gun until he was approached by the trooper. they say he appears to have been mentally disturbed. >> pete williams, thank you. doesn't is in full damage control mode over fire symptstorms he ignited on msnbc over abortion and nuclear weapons. he held a meeting with rnc officials behind closed doors and met with his own policy team face-to-face, for the first time. we have it all covered starting with nbc's katy tur. >> reporter: lester, 77% of women nationally say they have an unfavorable view of donald trump. trump stumbling on policy, now tried to reassure the party five days before wisconsin. 24 hours after trump faced deafening criticism on abortion and nuclear policy, he headed to washington, meeting with his foreign policy team and huddling with the republican national committee to talk party unity, reeling after his comments on abortion drew criticism from all sides. >> there has to be some form of punishment. >> for the woman? >> yes, there has to be some form. >> reporter: words he took back later, release this statement: "the doctor or any other person responsible would be held legally responsible, not the woman." gop leaders say, the ultimate goal will be to mitigate damage with young women while targeting older white women. >> i think this is another example of donald trump being completely unprepared to hold the highest office in the nation. >> reporter: at miss katie's diner in milwaukee, trump's gender gap was in mind. >> i think the country needs someone who can turn things around. >> reporter: younger woman are appalled by trump's blunt style. >> he's insulting towards women. he insults their appearance and their age. >> reporter: older women are more open to giving the candidate the benefit of the doubt. are you worried about what he would be like as a president? >> no, he's a businessman and i think he would surround himself with people who are in the know. >> reporter: now a pro-trump super-pac is on the air in wisconsin. >> sure, i get some grief when i say i'm voting for donald trump. but you know what, i want to protect my family. >> reporter: with cruz up 10 points in this state, is it too little, too late? katy tur, nbc news, milwaukee. >> reporter: this is andrea mitchell in washington, where donald trump's first meeting with his foreign policy team took place in a construction site for a trump hotel. blocks from where the president and world leaders were focusing on reducing the nuclear threat. >> of great importance to both of us is north korea's pursuit of nuclear weapons. >> reporter: but it was trump's call to increase the spread of nuclear weapons and possibly even use them that has him under fire tonight. those comments to chris matthews. >> can you tell the middle east we're not using nuclear weapons? >> i won't say that. i'm not taking cards off the table. >> what about europe? >> i'm not taking cards off the table. >> why not just say it? >> i am not taking cards off the table. >> reporter: tonight, trump slammed by the man in charge of the u.s. nuclear arsenal. >> i'm afraid this kind of talk in an election is just bluntly irresponsible. >> have you heard from allies about this? >> we have heard many comments about many statements made in this campaign. >> reporter: trump signaling he might expand the current nine-member nuclear club which now includes countries like the u.s., russia, and of course north korea. he's open to adding japan, south korea, even saudi arabia. >> at some point we have to say, you know what, we're better off if japan protects its against this maniac in north korea, we're better off, frankly, if south korea is going to start to protect itself. >> saudi arabia can have nuclear weapons? >> absolutely. >> reporter: but many republicans say that could set up a nuclear arms race and loose nukes. >> the notion that rogues will not get ahold of them and target us is ridiculous. >> reporter: the white house is calling trump's comments catastrophic, making donald trump's lack of foreign policy experience a central issue now in the campaign. lester? >> andrea, thank you. high drama for the democrats as well tonight. new video in of hillary clinton losing her temper while being pressed by an environmental activist at a rally. late details from nbc's kasie hunt. >> reporter: hillary clinton today flashing anger at her democratic rival on the rope line. >> i am so sick of the sanders campaign lying about me. >> reporter: that question following a rally on her home turf in new york, where she was also interrupted by bernie sanders supporters. [ chanting ] >> i know the bernie people came to say that. we're very sorry you're leaving. >> reporter: clinton had been trying to keep her focus on donald trump but the tension today underscoring sanders is still a significant threat to clinton in the democratic race. sanders tonight in her backyard with thousands of people rallying for him in the bronx. new york votes after wisconsin. sanders is up 49% to clinton's 45% in the badger state. clinton leads by 12 points in the latest new york poll. keeping the sanders campaign afloat, the money is still pouring in, more than $40 million just in march. >> in 11 months we have received over 6 million individual campaign contributions. >> reporter: his campaign still insisting they have a path to win. bernie sanders rallying tonight in new york before he heads back to wisconsin tomorrow. hillary clinton has also added to her schedule there, showing just what a battleground that's going to be, lester. >> kasie, thank you. new warnings being saturday as a violent storm pushes across the south, spawning tornadoes, tearing apart homes and businesses. 34 million people in the path as the threat continues into the evening. nbc's steve patterson is in the storm zone tonight. >> reporter: tonight, round 2. savage spring storm system that kicked off wednesday returns. >> look at that wind. >> reporter: already today, hail pounding illinois. this evening, communities across the south and midwest prepare for relentless rain and dangerous winds on top of a new tornado threat. tonight, 34 million americans across 13 states in the crosshairs, from the great lakes to the gulf coast. in mississippi, ravaging rain. a police car hydroplaning into a power pole. the vehicle damaged but the deputy walks away. in oklahoma, surveying the damage. >> telephone poles can fall. let's just stay out of the way. >> reporter: tulsa's mayor touring after multiple tornadoes touched down, injuring seven and damaging homes and this church. >> we were huddled right in here. we just were all ba ball ed up in a ball here. >> reporter: more rain after flooding led to a daring water rescue last night. and a flight from dahl's to memphis diverted due to turbulence. >> the guy behind me said, "are we going down?" >> reporter: now a widespread watch for more severe weather that could have greater consequences as nightfalls. here in mississippi, the wind is just starting to pick up. this state, along with tennessee and arkansas, all with active tornado watches until late tonight. lester? >> steve, another rough night ahead. now to those bombshell secret tapes exposed and a growing scandal swirling around the governor of alabama. he's refusing to resign under threats of impeachment from fellow lawmakers as allegations of an affair with a top aide go public. nbc's kerry sanders has the tale of the tapes. >> reporter: with calls for his resignation today, embattled governor robert bentley. >> there's nothing that will affect the people of alabama or my job. >> reporter: the 73-year-old who was swept into his second term for governor on a platform of family values, is accused of an affair with his aide, rebecca mason. leaked audiotapes are believed to be the governor talking on the phone with his alleged mistress. >> when i stand behind you, and i put my arms around you, and i put my hands on your breasts, and just pull you in real close, i love that too. >> reporter: the governor and his wife diane divorced last year after a 50-year marriage. according to the website yellowhammer.com, which obtained the audio, it was recorded by diane bentley two years ago. rebecca mason has also denied an affair, but resigned from her job yesterday. she was not a state ploy employee but was paid by bentley's campaign and another private group. >> it has become apparent to me that rebecca mason has wielded a level of influence over both the governor and state government that i have never seen. >> reporter: tonight, there's a growing momentum to impeach. >> the governor needs to resign immediately. if he doesn't resign, the governor needs to be impeached. >> reporter: with a state ethics investigation now under way, what may or may not have happened here has yet to play out. kerry sanders, nbc news, miami. still ahead tonight, embryo adoption. the little-known practice that's helping people start families of their own through the generosity of other couples. also, they win more than the men's team but get paid so much less. now some of amer my opioid pain medication is slowing my insides to a crawl. that's opioid-induced constipation, oic, a different type of constipation. i'm really struggling to find relief... paint a different picture. talk to your doctor about oic and prescription treatment options. to help protect your dog or cat from fleas and ticks. with the performance you expect from a monthly topical in a non-greasy collar... seresto® kills and repels fleas and ticks for 8 continuous months. seresto®. from bayer. i built my business with passion. but i keep it growing by making every dollar count. that's why i have the spark cash card from capital one. i earn unlimited 2% cash back on everything i buy for my studio. ♪ and that unlimited 2% cash back from spark means thousands of dollars each year going back into my business... that's huge for my bottom line. what's in your wallet? her long day as anne. hair stylist starts with shoulder pain when... hey joanne, want to trade the all day relief of 2 aleve with 6 tylenol? give up my 2 aleve for 6 tylenol? no thanks. for me... it's aleve. there is new hope for the millions of american women who have trouble conceiving. after successful in vitro fertilization, there can be tough choices for couples about what to do with unused embryos. some donate them to other couples hoping to start a family. nbc's janet shamlian tells us more. >> reporter: it's a chance at a family rain and richard galloway never thought they would have. >> couldn't have gone any better. >> reporter: unable to conceive on their own, a doctor implanted the embryo of another couple into rain's uterus. >> people don't realize how valuable it is until they can't have it. >> reporter: the number of women using implanted embryos doubled between 2009 and 2013. >> part of it is simply the fact that it's less expensive. >> reporter: about half as much as in vitro fertilization. as many as a million embryos are in storage nationwide, leaving couples like april and jeff watts who created them with a decision, what to do with the extras. >> they were potentially hopes and dreams of mine. i knew they would be potential homes and dreams for someone else. >> reporter: the watts have two sets of twins. their family complete, for religious reasons they didn't want to destroy the embryos or give them to research. they connected over facebook with the galloways. >> is it weird or creepy that you could have this biological child that is really not part of your family at some point? >> absolutely. we've talked to rain and richard about that. they know it's hard. >> it almost feels like you're giving the babies up to someone else, right? you have to pull back and realize, okay, this makes sense. >> reporter: rain hasn't become pregnant yet. but another embryo will be transferred soon. >> what would it mean to you to have a family? >> it would be a huge answered prayer. >> reporter: a surgeon donated embryos, providing a different path to parenthood. janet shamlian, nbc news, tennessee. there's more ahead tonight. we're back in a moment with a desperate race to find survivors after a deadly catastrophe. they call it planning for retirement because getting there requires exactly that. a plan for what you want your future to look like. for more than 145 years, pacific life has been providing solutions to help individuals like you achieve long-term financial security. bring your vision for the future to life with pacific life. talk to a financial advisor to help build and protect your retirement income. pacific life. the power to help you succeed. ♪ to you, they're more than just a pet. so protect them with k9 advantix ii. it kills fleas, ticks and mosquitoes. k9 advantix ii. for the love of dog. once i left the hospital after a dvt blood clot. what about my wife... ...what we're building together... ...and could this happen again? 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finally tonight, a love story for the ages that all began with a twist of fate during the second world war. a woman whose romance bloomed across an ocean with every care package that was sent to her. and now, as our joe friar reports, she's paying forward the kindness she received. >> reporter: from the mountains of colorado, helga writes a letter to a refugee overseas. >> it's never easy to have to leave one's homeland. >> reporter: her heartfelt note will accompany a care package which she and her husband leo are sending, returning a favor 70 years in the making. you see, at the end of world war ii, when helga was 16, she too became a refugee as the soviets marched into berlin. she and her mother narrowly escaped. >> the next to the last train that never left the city. >> reporter: she ended up in bavaria, where she met a u.s. soldier. this is the soldier you met, right? >> yes, indeed. >> reporter: after he returned to america, that soldier began to send he wilga care packages filled with much-needed food. helga and the soldier exchanged more than a hundred letters, and eventually ex changed vows. now helga and leo are sending their own package to a syrian refugee. she opens the box and reads helga's letter, a moment later watched by the kissels. overwhelmed, she thanks helga, saying, "she made me feel like i exist." >> you exist. here i am. an old lady, being able to give a little bit of comfort to such a young person who has all her life ahead of her. >> reporter: helga knows firsthand just how wonderful that life can be. joe friar, nbc news, colorado springs. that will do it for us on a thursday night. i'm lester holt. for all of us at nbc news, thank you for watching and good night. late night trump roast. the donald launches a thousand punch lines. >> now on "extra." a cartoon trump on colbert. >> you are sounding a little immature. >> i know you are, but what am i? >> under fire on fallon. >> i'm suing you for being a reporter. >> the late night shows attack trump. his arch enemy rosie going off about his run today. >> he will never be president. >> plus, why she's back in a new york courtroom today facing her ex. the stars of the smash o.j. miniseries stepping into the "extra" confessional. >> did you have a chance to meet o.j. simpson? >> who talked travolta into he . sarah paulsen on the hook-up rumors. anderson cooper's designer mom gloria vanderbilt revealing her secret lesbian fling. >> with a girl in school. >> hello. then, jessica simpson cleav.