What is absolutely clear is that if Trump is the nominee, Republicans cannot win. Maybe they can't win with Rubio or Cruz or Kasich. We don't know. But what is absolutely certain is that with Hillary Clinton locking up the Democratic base, she is going to win unless she has a strong contender who is going to be able to pull - not only bring the entire Republican Party on the side, but win moderates. Donald Trump cannot do that.

Who knows better than you what it means to have a commander-in-chief who lived his entire life, who lived throughout the entire Cold War, and doesn't know what the nuclear triad is? It's absolutely astonishing. And so it's terrific to have Joe Dunford and you know, perhaps John Bolton and other people in positions of trust.

What is absolutely clear is that if Trump is the nominee, Republicans cannot win. Maybe they can't win with Rubio or Cruz or Kasich. We don't know. But what is absolutely certain is that with Hillary Clinton locking up the Democratic base, she is going to win unless she has a strong contender who is going to be able to pull - not only bring the entire Republican Party on the side, but win moderates. Donald Trump cannot do that.

When it comes to trade, when it comes to standing up to countries like North Korea, when it comes to standing up to guys like Vladimir Putin, Donald Trump is not a conservative.

The only person who counts in the administration is the president of the United States.

The United States survives so long as at least one of its major parties is politically and intellectually healthy.

I think a Donald Trump presidency raises a new kind of version of conservatism which more closely resembles a kind of Father Coughlin, America first populism and nativism and isolationism, than the confident, modern, cosmopolitan, thoughtful, engaged conservatism of Ronald Reagan and Paul Ryan.