Nuclear deal. Plus our panel and look back at the Oklahoma City bombing. Its all ahead because this is face the nation. Captioning sponsored by cbs good morning. When we sat down with marco rubio at the Manchester Community college he had choice words on Hillary Clinton, we may have to go to war with iranians to stop them from building a Nuclear Weapon. And he talks candidly about deciding to run against his friend and mentor jeb bush. We started with a simple question. Why do you want to be president. I believe the country is at an historic moment. An era of extraordinary opportunity. Allowing our nation to fulfill the potential. I believe i have the ideas for the country, i believe i have the vision for the country and positioned to help lead this country to this new american century. The 21st century will be better. Been it theres some things we have to do to make that happen. You said the other day that this election presents a generational choice about what kind of country were going to be, didnt we just do that . I think obama campaigned on some of those themes unfortunately his ideas dont help achieve it. Not just to have new ideas but good ideas. Schieffer youre young grew bright youve been in the senate but to the for a very long time. A lot of republicans think the last time they chose somebody with that very same profile they didnt choose, but didnt work out very well. How do you convince your party youre not you know who . I think theres a dramatic difference from president obama and i and our experience. Only candidate thinking about running for president that served at the local, state and federal levels so nine years in Florida Legislature i was speaker of the husband ill have served a term in the senate. Im prepared for that. Schieffer lets talk about immigration. Youre hispanic. You have a wonderful life story you were part of that Bipartisan Group that put together an Immigration Reform bill. You voted for it then got a lot of heat from people in your own party, you walked away from it. Thats not accurate assessment. What im saying we cant do it in a piece of legislation i know, i tried. We understand that we have to deal with 12 million human beings that have been here longer than decade, we know we have to deal with it. Were not prepared to deal with it until first you can prove to us this will never happen again. Schieffer if you became president , would you sign the bill that you put together into law . Thats a hypothetical that will never happen. What i would do first thing i would do ask congress to pass their specific bill that puts in place everify, entryexit tracking to improve security on the border once we achieve that, that will modernize our Legal Immigration system. Less family based more merit based. Third step, pass the bill that goes to ten Million People that are here, been here longer than a decade have to pass background check, have to learn english have to pay taxes, have to pay a fine. Get a work permit. After substantial period of time in that status assuming they havent violated any of the conditions of that status they would be allowed to apply for legal residency just like anybody else would. Not a special process. After legal resident after number of years by law allowed to apply for citizenship a. Long process, a reasonable process, a fair process. But it has to happen in that order. It begins with enforcement measures. Schieffer your friend your mentor, former Florida Governor jeb bush, you say you are youre not running against him, but how can you not run against him . I have a tremendous personal admiration for him. My view there will be multiple people rung. We were blessed as republicans a strong field of quality people that are running i think democrats are struggling to find one. We have eight or nine. Were going to be a better party for it. America is going to get a better president for it. Schieffer was that hard for you to decide well hes going to run too but im unique situation. I dont think anyone could envision that. Comes point in time where if you have an opportunity to serve your country legitimately serve your country especially someone feels tremendous debt to america its an opportunity i had to take seriously. At the end of the day wont change how i feel about governor bush, he will remain my friend and someone i admire. Schieffer why would you be a better president than Hillary Clinton. I believe the Clinton Presidency would be another four years of barack obama. To this point im not seeing her distinguish herself on a single issue with what the pot president is doing now. That is true on Foreign Policy. We cannot ignore secretary of state during first four years of the Obama Presidency virtually no meaningful achievements. We set russia or response to benghazi or everything in between theres obama Foreign Policy during the clinton years as secretary of state have been disaster for americans. Today our allies enemies fear us less, less influence in the world today than it did four to six years ago. Schieffer what is the single most important issue, biggest challenge in this campaign and for the next president . Is it Foreign Policy . Always begins with Foreign Policy, most important obligation of federal government to keep us safe. Today we face threats from abroad that are multifaceted in comparison to what they were 10 or 20 years ago. Face the risk of rising china erosion of natosability to blunt putins efforts. We see the rise in the middle east both multiple radical jihaddists groups, the world has multifaceted schieffer do you think were winning . I dont think were doing as well as we could be. On any of these fronts. Schieffer can you senator, envision under any circumstances sending american Ground Forces back into the middle east . Its not the ideal outcome. There are circumstances hypothetically that it would happen. It isnt the best option. Best option would be combination of sunniarab combined army. Who confront a radical sunny group on the ground and defeat them in combination with u. S. Air support u. S. Logistical and u. S. Special operation forces. That is the best option moving forward. In the on sense of that, we have outsourced ground operation the shia ma legss under control of iran theyre not leaving. If isis is defeated, they will then become predominant group on the ground you just triggered whole new era of iranian influence over iraq. Also increase for sectarian violence in that region for years. Schieffer does that present a threat to the American People . To begin with. Iran continues to develop long range rockets. Theyre not trying to put a man on the moon. The reason why theyre developing Intercontinental Ballistic Missiles to hold leverage point initially against europe ultimately against the United States. Schieffer where do you come down on trying to limit Nuclear Weapons . I dont think they will be successful. Leaving in place will provide antiaircraft capabilities. Chinese will build Nuclear Reactor capability. All of which is basic infrastructure you need to weaponize that schieffer if you dont get a deal, what is the alternative do we have to go to war . Is it necessary to be absolutely certain they dont have a Nuclear Weapon . Absolutely. I think best way to achieve that leave in place the unilateral sanctions and International Sanctions can you combine with that very clear demarcation of the regime. If you cross this threshold you will face military action on the part of the United States. Dough we dont want that to happen. The risk of nuclear iran so great that option must be on the table. Schieffer if it came to that you would that would be option that you would actually absolutely. Schieffer and use . Let me tell you why. If we dont do it someone else will. The saudis will not watch them build a bomb. Israelis will not sit there watch regime that calls for their destruction. But again we would hope to have avoided that point by severely limiting and sanctioning iran for nuclear ambitions, quite frankly i think this deal could literally deal to increasing prospects for war but schieffer we cannot let iran become a nuclear ally. We have to do whatever is necessary if that includes going to war . If iran doesnt need nuclear power, oil rich country, only reason why they want enrichment to one day be able to be Nuclear Threshold or nuclear schieffer let me ask you talking about things on earth lets talk about things above the earth whole idea of Climate Change. You have said, if im correct that humans are not responsible for Climate Change. Did you say that . I said humans are not responsible for Climate Change in the way some of these people out there are trying to make us believe for the following reasons. I believe climate is changing because theres never been a moment where the climate is not changing. The question is, what percentage of that or what human activity if we do the things they want us to do, how much will that change the pace of climates change versus how much will it cost to the economy. Scientists cant tell us what impact it will have on reversing these changes. But i can tell you with certainty have devastating impact on our economy. Schieffer talk about social issues. You have said youre against gay marriage. Do you think that homosexuality is a choice . Not that im against gay marriage, the definition of institution of marriage is between one man and one woman. Faith has also regulated, if state wants to have different definition have a political debate. I dont think courts should be making that decision, i dont believe same sex marriage is constitutional right. I also dont believe that special preferences war choice, in fact the bottom line is, i believe sexual preference something that people are born with. Schieffer senator, we thank you. Thank you. Schieffer marco rubio now i want to give you the very latest on the tragic breaking news from overseas fishing boat carrying the estimated 700 migrants capsized in waters in libya overnight people trying to get out of libya but u. N. Officials says they fear this is a tragedy of vast proportion. Cbs news of course will continue to follow this story. But we want to get back to politics now turn to democratic governor mart in omalley may challenge hill he reclinton. While all these republicans in New Hampshire she was out in iowa driving around in a little van out there. Just first, are you going to do this . Are you going to challenge her for the democratic nomination . Im very seriously considering that. Ill make up my mind by the end of may. Schieffer why . Our country faces big challenges. I know that leadership is important if were going to turn these challenges into opportunities. I have 15 years of executive experience as big city mayor and as a governor bringing people together to, get things done. And i believe that i have the ideas that will help our country move forward to a time when our economy is actually working for all of us again instead of wages declining. Are you going to run against her or are you going to run against republicans . The republicans is pretty clear theyre running against Hillary Clinton. Do you join in that group . Do you have a different story to tell . I think that the best campaigns are not campaigns that are against. Campaigns that are for. In other words, our country is doing better than we were four years ago. Were creating jobs. But the vast majority of us are working harder and falling behind. Wages are declining in the United States of america. I believe that we need to do in order to bring people together is to talk about the ideas. Especially if were going to be the party that actually leads america into the future. Let me ask you the same question i asked marco rubio, why would you be a better president than Hillary Clinton . Because of the experience that i can bring to this job bob. The seven years as mayor of baltimore, eight years as the governor of a state. I guided our state through this recession and i did so with results that actually mattered. The highest Median Income in the country, middle class is upwardly mobile. Greater participation fuller participation of my citizens and economic social, political life of our state. Difficult things like passing marriage equality. Passing the dream act. Doing common sense thing that allow new american immigrants to fully participate, pay their taxes, play by the rules and take care of their families. That is the inclusive america that i believe all of us want to move to. Schieffer what do you think of way she launched her cam in . All these republicans are out there making speeches, kind of doing it the Old Fashioned way she gets in this little van and drives all the way out there, giving no interviews as far as i can tell. Hasnt had a news conference. Can you get the nomination that way and how will you do it . Ill let others talk second guess her strategies and tactics she can certainly defend herself. I have a tremendous amount of respect for secretary clinton. Best way to campaign is one on one. You cant forge a new sort of consensus, you cant forge Public Opinion by following Public Opinion you have to engage with people in living room after living room and lunch counters that is the best type of campaign as one on one contact. We talk about better choices we need to make to get earn tongs rise again. Schieffer do you think that having more candidates is good for the Democratic Party . Here is a party that won last two president ial elections. Yet it comes down to there seems to be this one candidate. Shouldnt there be more people out there. Shouldnt the party why nobody but you, i dont mean this in deprecating way towards you you seem to be the lone guy even thinking about challenging. Im not sure why that is. But i think it would be an extreme poverty indeed if there werent more than one person willing to compete for the president ial nomination of the Democratic Party. This is the way i this its supposed to work. If you had the executive experience, ideas that can serve our nation well and ability to govern you should offer your candidacy let the people decide. If we do that then we can be the party that leads our country into the future but we wont do it unless we offer ideas for the future and break with trade deals, systematic deregulation of wall street that Many Democrats were complicit in and helped get us into this mess. Bob governor, than you, i hope youll come back with your decision. Thanks very much. Schieffer we will be back in just a minute. Theres some facts about seaworld wed like you to know. We dont collect killer whales from the wild. And havent for 35 years. With the hightest standard of animal care in the world, our whales are healthy. Theyre thriving. I wouldnt work here if they werent. And Government Research shows they live just as long as whales in the wild. Caring for these whales, we have a great responsibility to get that right. And we take it very seriously. Because we love them. And we know you love them too. The pursuit of healthier. It begins from the second were born. After all, healthier doesnt happen all by itself. It needs to be earned. Every day. Using wellness to keep away illness. And believing that a single life can be made better by millions of others. Healthier takes somebody who can power modern health care. By connecting every single part of it. For as the world keeps on searching for healthier. Were here to make healthier happen. Optum. Healthier is here. B were back with West Virginia senator joe manchin im going to get away from the politics for just a minute talk a little bit about whats going on with this proposed deal with iran. The Supreme Leader there says that we cant do inspections on military bases there. Senator rubio says he doesnt think the deal will go through im beginning to agree with him. I think its going to be difficult to get it done under these conditions. Whats your take here . Patrioter negotiate for peace. You look at his tore are where we are 2003 had 164 centrifuges president bush and administration took hard line stance. Fast forward to today got 19,000. Since they started talking about a year and a half ago at least stop from progressing. We dont trust iran they dont trust us. Its about verifying. Schieffer if you dont have inspections, real inspections, how can you really be sure . Ive been told from all meetings that we are having real inspections. They are in there. Basically the first time, they are able to be there. Those are the people with expertise as far as secretary of energy with his expertise. Youve got to believe some of the people that have that ability to evaluate. Going back into cocoon saying we dont trust, walk away from this. I dont think theres senator that doesnt want to be involved in this process. Ive signed on to menendez that says as of june 30 we will have sanctions. Let the people that are skilled. Schieffer lets get back to poll fix we can. Do you think Hillary Clinton should have competition . Would you like to see more serious democrats in the race . My question is, arent there more serious democrats in the race . You know, bob. I support Hillary Clinton. I