Here at home, we need to do two fundamental things. Number one, we need to recognize that technology has moved on. The Patriot Act was signed in 2001, roughly. The iPhone was invented in 2007. The iPad was invented in 2011. Snapchat and Twitter, all the rest of it, have been around just for several years. Technology has moved on, and the terrorists have moved on with it.

Marco Rubio was fighting to grant amnesty and not to secure the border, I was fighting to secure the border. And this also goes to trust, listening on to campaign trails. Candidates all the time make promises. You know, Marco said," he learned that the American people didn't trust the federal government."

If you look on the Republican side, the two Republicans who have most energized young people in modern times are Ronald Reagan and Ron Paul.

For anyone who doesn't believe that Donald Trump is the best candidate to go head to head with Hillary Clinton in November, and that's about 70 percent of Republicans nationwide who don't think Donald Trump is the right guy, our [President's] campaign is the only campaign that has beaten Donald Trump and that can beat Donald Trump.

Under President (George W.) Bush, prosecution of gun crimes was 30 percent higher than it is under President Obama.

What we saw with both Donald Trump and Marco Rubio, that their response, whenever you point to anything in their record, is just to yell, "Liar, liar, liar," and to get very personal and to make direct character attacks. And my approach, from the very beginning of this President's campaign, starting a year ago in 2015, is that I will not respond in kind. I do not intend to insult any of the candidates.

We need a president who stands up, number one, and says, we will defeat ISIS. And number two, says the greatest national security threat facing America is a nuclear Iran.