U.S. commitment to NATO and our commitments our European partners is not an act of charity. It's not a gift that we give to our European partners. It's actually part of our security, as well, and their security is our security.

Trump's rhetoric is undermining America's credibility, undermining America's leadership and strength in Europe, even without him being president. The rhetoric itself is very damaging. Obviously, if you were to try to implement any of that rhetoric as president, it would be catastrophic for America's interests.

U.S. commitment to NATO and our commitments our European partners is not an act of charity. It's not a gift that we give to our European partners. It's actually part of our security, as well, and their security is our security.

It's a brutal regime, in the Assad regime, that is willing to take any measure, no matter how immoral or war criminal acts, to persecute its goals.