Words matter when you run for president. And they really matter when you are president.

I rarely meet a young man who doesn't already think he is.

We know that Donald Trump has shown a very troubling willingness to back up Putin, to support Putin, whether it's saying that NATO wouldn't come to the rescue of allies if they were invaded, talking about removing sanctions from Russian officials after they were imposed by the United States and Europe together, because of Russia's aggressiveness in Crimea and Ukraine, his praise for Putin which is I think quite remarkable.

I'm very pleased we got that nuclear agreement. It puts a lid on the nuclear weapons program. We have to enforce it, there have to be consequences attached to it. But that is not our only problem with Iran.

I have been very clear about the necessity for doing whatever is required to move the VA into the 21st century.

[Donald Trump] tried to switch from looks to stamina. But this is a man who has called women pigs, slobs and dogs, and someone who has said pregnancy is an inconvenience to employers.

That is the number-one threat we face in the world. And it becomes particularly threatening if terrorists ever get their hands on any nuclear material. So a man who can be provoked by a tweet should not have his fingers anywhere near the nuclear codes, as far as I think anyone with any sense about this should be concerned.