The fbi agent, getting down. His backflip on the dance floor. His weapon falling out, firing into the crowd. Striking another partygoer. And good evening. Thanks for joining us on this sunday. Im tom llamas. We begin with the stunning new claim from president trumps personal attorney. Ramping up the challenge to the russia investigation. Rudy giuliani saying that even if the president would be found guilty of a crime, he could pardon himself. Coming after we learn of a memo the president s legal team wrote, saying he cant be found guilty of obstruction of justice. The president s team also speaking out on why he cant be forced to testify. Heres tara palmeri at the white house. Reporter tonight, the shocking suggestion made by one of trumps lead attorneys about the scope of the president s powers. Do you and the president s attorneys believe the president has the power to pardon himself . Hes not, but he probably does. Reporter Rudy Giuliani was responding after a secret memo sent to the special counsel leaked to the new york times. In it, trumps lawyers claim that the president cant be guilty of obstructing justice, and has the authority to terminate the case. While giuliani said a selfpardon may be legal, he acknowledged it would come at a high political price. The president of the United States pardoning himself would just be unthinkable and it would it would lead to probably an immediate impeachment. Reporter giuliani serving notice. If mueller attempts to subpoena the president to testify about russian collusion or obstruction, they will fight it out in court. A president can go before a judge and say its for purposes of harassment. Its unnecessary. Reporter experts are skeptical of whether the broad president ial powers laid out by trumps legal team are valid. The notion that suddenly obstruction of justice is not something a president can ever do is a radical theory. Reporter tonight, more revelations from that 20page secret memo. For the first time, trumps attorneys admit the president dictated the initial response about his son don juniors meeting with a russian attorney months before the election. Something the white house had previously denied. He certainly didnt dictate, but he, like i said, he weighed in. Reporter when asked about this, giuliani used it as an example for why the president shouldnt go before mueller. First, it was all denied and now youre saying he dictated it. I mean, this is the reason you dont let the president testify. If, you know, every our recollection keeps changing, or were not even asked a question and somebody makes an assumption. Tara, the president tweeting today, attacking the fbi for not informing him they were investigating Campaign ChairmanPaul Manafort leading up to the election. Reporter tom, the president is accusing the Justice Department of being unfair. He said they should have told him they were investigating manafort. Distancing himself from his former campaign manager, saying he would have never hired him if he knew. Thank you. Next to the hunt for a killer before he strikes again. Police in arizona asking for the publics help. Looking for this man, suspected of links to three shooting deaths. And authorities now looking closely at a fourth murder in the past 24 hours. Marci gonzalez is in scottsdale. Reporter tonight, police desperately trying to piece together who could be behind a string of shootings that have left four people dead in the phoenix area. They heard shots, think somebody is hurt. There was a lot of argument. Reporter detectives trying to determine if the shooting death of a life coach this weekend is connected to the deaths of a prominent forensic psychiatrist killed in broad daylight and two paralegals, gunned down less than 24 hours later. Right now we are doing our best to locate this suspect, to reporter the first vtim, dr. Steven pitt, known for his consulting work on highprofile cases including Jonbenet Ramseys death, and the jodi arias trial, killed outside of his Phoenix Office at around 5 30 thursday evening. Then friday, seven miles away, paralegals veleria sharp and laura anderson, shot inside this office that specializes in family law, helping clients in times of emotional stress. One of the women, shot in the head, managing to walk outside, begging for help. A female came running up to the bus. She is bleeding from her face. She says she thought she may be dying. Reporter she later died at a hospital. Police following her blood trail to find her coworker also dead. Police believe the same gunman is behind those three homicides. But early saturday morning, yet another crime scene. Marshall levine found shot to death in his scottsdale office. Police looking into whether this case is linked to the others. Investigators releasing this sketch of a possible suspect they are desperately trying to find. A very active scottsdale. This is getting lots of attention and investigators are asking for the publics help . Reporter thats right. And they had a couple of possible leads on a suspect, but theyve been ruled out. Theyre now going through the hundreds of tips that have come in, hoping one will lead to the killer. Tom . Thank you. We turn now to weather and the battle to contain wildfires burning in the west. This one threatening homes in laguna beach, california. Heavy rain in the east bringing down this tree on top of a home in washington, d. C. Heres rob marciano. Reporter tonight, severe wind and drought fueling wildfires in the west. California firefighters throwing everything at this blaze in laguna beach. Aircraft attacking from above. Mandatory evacuations in effect. Reporter thousands evacuated as the flames closed in. The ute fire in new mexico still raging out of control, doubling in size over the weekend. 300 homes threatened. In colorado, an allout aerial assault on this fire north of durango. Hundreds evacuated. The flames torching nearly 2,000 acres and the fire still growing. This, as Severe Weather torments arkansas. Sheets of blinding rain washing out this road in atkins. Winds up to 100 Miles Per Hour demolishing this hangar at delta regional airport. And flooding rains continues in the midatlantic. A state of emergency for parts of west virginia. While heavy rain in washington, d. C. , sent a tree through the roof of this house. Felt like an earthquake. Reporter parts of i95 outside washed out. These highway workers wading in the flooded median. And rob joins us now live. You mentioned washington, d. C. , ask the now were looking at the same area where we saw the wall of water last weekend. Yes, in ellicott city. Now, heavy rain falling now, and its saturated. The low pressure system being squeezed by the front and more heavy rain tonight. Moving to philly, new york, hartford for the morning rush, and pushing up to new england for the evening rush. And a severe thunderstorm for new mexico. Wildfires continuing out west. And we want to go to hawaii, where more than a dozen people are stranded. Officials say they went door to door to try to evacuate people, but some chose to stay without power, phones, or running water. Next in denver, danger on the dance floor. An offduty fbi agent dancing when his gun fell out of his holster, going off, striking a man in the leg. Heres clayton sandell. Reporter tonight the fbi says its reviewing this incident that began with an agent cutting loose on the dance floor. But as he goes for a backflip, its his handgun that slips loose, falling to the floor. It gets worse when he picks it up. Accidentally firing. Hitting a man in the crowd at a denver nightclub. Just have a party shot, says inside the bar. Party shot in the leg. Reporter take another look. As he reaches down, you can see that muzzle flash. The agent holsters the handgun as the crowd backs away. They are saying the gun went off from someones pocket. Were out with the suspect with the firearm. Reporter police took the fbi agent in for questioning early saturday morning, later turning him over to a supervisor. No matter who you work for local, city, county, federal police, all the rules apply to you, on or offduty. Anybody thats sworn that pulls out a gun in a social setting and harms somebody else, is in big trouble. Reporter the man who was shot in the leg went to a hospital but is expected to be okay. Tonight, the fbi hasnt said if the agent will face discipline or if he was drinking at the time. Denver police say the District Attorney will decide if the agent will face any charges. Tom . Clayton, thank you. Next to the Major Medical headline. A new study finding that tens of thousands of women with Early Stage Breast Cancer may not need chemotherapy. Heres dr. Jen ashton. Reporter tonight, new hope for the thousands of women like catherine floyd, whove faced the brutal effects of chemotherapy while fighting Breast Cancer. I had nausea and i lost my hair. It felt like the worst flu id ever had, times ten. And you have absolutely no energy. Reporter but a new landmark study finds that at least 70 of Early Stage Breast Cancer patients may not need chemotherapy. The trial, designed to answer the question of whether or not chemotherapy reduces cancer recurrence and saves lives in women with the most common type of Early Stage Breast Cancer. The trial used a gene test done on tumors to help decide whether a woman would benefit from chemo or if they could receive hormone therapy. Using this test, researchers found that chemotherapy did not add any benefit in survival rates or recurrence for most women. But researchers say some women 50 and younger, in high risk groups, might still need chemo. This is major headline, but what should patients know, because you just said its not for everyone. This is for a woman at intermediate risk for that cancer to recur. We used to say, better safe than sorry. This trial lets us say to those women, you will do fine without chemotherapy and spare all of the stuff that comes along with that. The big question, cost. The test is widely covered by insurance, but it comes with about a 3,000 price tag. Dr. Ashton, thank you. In parkland, florida, it was Graduation Day for Marjory Stoneman douglas high school. Heres erielle reshef. Reporter a father standing firm. A mom, holding up a diploma wearing a shirt reading, this should have been my son. Graduation day nearly four months after their child Joaquin Oliver and 16 others were murdered at Marjory Stoneman douglas high school. The four victims who would have graduated, honored today with posthumous degrees. For students like ariana ortega, its a milestone mixed with memories of her classmates who should have been there beside her in cap and gown. I will 100 be thinking of my friend Carmen Schentrup as i walk across that stage, as i wish that she could be walking across it with me, as i wish she be going off to college with me. Carmen will forever be with me. Reporter since the rampage, parkland survivors channelling their pain into a forceful push for policy changes to address gun violence. Were not trying to take your guns. We never have been and we never will. What we want is common sense legislation. Reporter their impassioned pleas echoing across the country. Hundreds of thousands marching in solidarity. Smaller rallies continuing even this weekend. Young activists born from tragedy, now looking to make their mark on the future. Tom, in the weeks after that shooting, the republican governor of florida did enact sweeping gun reform. The students now hoping to use their voice and votes to change laws on the national level. Tom . Erielle, thank you. Well have more from that emotional Graduation Day and what some of those students plan to do next. Tune in to gma and nightline tomorrow. Much more ahead on world news tonight this sunday. A major warning from a mother as we head into summer. Little kids and sunscreen. The allergic reaction that could be painful for children. And the plane crash in the hamptons. What may have caused that deadly crash. Stay with us. More after this. With 5 times more regions ancestrydna can pinpoint where your ancestors are from and the paths they took to a new home. Could their journey inspire yours . Order your kit at ancestrydna. Com alicewhich is Breast Canceratic that has spread to other parts of her body. Shes also taking prescription ibrance with an aromatase inhibitor, which is for postmenopausal women with hormone receptorpositive her2 metastatic Breast Cancer as the first hormonal based therapy. Ibrance plus letrozole was significantly more effective at delaying disease progression versus letrozole. Patients taking ibrance can develop low white blood cell counts, which may cause serious infections that can lead to death. Before taking ibrance, tell your dtor if you have fever, chills, or other signs of infection, liver or kidney problems, are pregnant, breastfeeding, or plan to become pregnant. Common side effects include low red blood cell and low platelet counts, infections, tiredness, nausea, sore mouth, abnormalities in liver blood tests, diarrhea, hair thinning or loss, vomiting, rash, and loss of appetite. Alice calls it her new normal because a lot has changed, but a lot hasnt. Ask your doctor about ibrance. 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He had blisters all over his face. I had never seen anything like it. Reporter carsten says the doctor told her 1 1 2yearold greyson suffered a severe allergic reaction to aerosol sunscreen. His hands were like baseball catcher mitts. You could have popped them with a pin. Reporter carstens says she used the sunscreen on her older kids with no problem. Experts say allergic reactions like greysons are rare but can be dangerous and painful. If youre dealing with a young infant or toddler who has really sensitive skin to begin with, it is best to err on the side of caution and look for those mineralonly sunscreens. Reporter dr. Whitney bowe says wear protective clothing while in the sun and do a patch test. You can apply a small amount of sunscreen on are of their childs skin, arm or neck, and see if they react. And if they are not reacting, you can feel more comfortable using that sunscreen from head to toe. Reporter experts say its also important to look for the words Broad Spectrum so youre covered against uva and uvb rays. Both can cause skin cancer. Tom . Stephanie, thank you. Up next, we first showed you this wild video last night. Now, an update from officials about the woman behind the wheel in this deadly incident during a Little League game. And, new hope for iphone addicts. The new headline about an initiative about to debut. Stay witus. And i take trulicity once a week to activate my body to release it, like its supposed to. Trulicity is not insulin. It comes in a onceweekly, truly easytouse pen. And it works 24 7. Trulicity is an injection to improve blood sugar in adults with type 2 diabetes when used with diet and exercise. Dont use it as the first medicine to treat diabetes, or if you have type 1 diabetes or diabetic ketoacidosis. 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