I actually believe that we need missile defense, because of Iran and North Korea and the potential for them to obtain or to launch nuclear weapons, but I also believe that, when we are only spending a few hundred million dollars on nuclear proliferation, then we're making a mistake.

As we keep up the pressure, our air campaign will continue to hit ISIL harder than ever.

The biggest threat that we face right now is not a nuclear missile coming over the skies. It's in a suitcase. This is why the issue of nuclear proliferation is so important. It is the - the biggest threat to the United States is a terrorist getting their hands on nuclear weapons.

I will cut investments in unproven missile defense systems.

Issues are never simple. One thing I'm proud of is that very rarely will you hear me simplify the issues.

International inspectors are on the ground and Iran is being subjected to the most comprehensive, intrusive inspection regime ever negotiated to monitor a nuclear program. Inspectors will monitor Iran's key nuclear facilities 24 hours a day, 365 days a year. For decades to come, inspectors will have access to Iran's entire nuclear supply chain. In other words, if Iran tries to cheat - if they try to find build a bomb covertly, we will catch them.

With respect to some of the specific legislation or initiatives that I've made, it's true that Republicans often opposed these things. Sometimes they opposed them because I proposed them. Now that they are responsible for governing, I think they'll find that reversing them would be counterproductive.