Ivo Daalder

We have built up, through our global engagement, a set of institutions that have been built on trust, fundamentally on trust, where allies had trust in the United States to do the right thing when it really came down to it.

On climate change, the science is clearer about what you need to do to get a real impact than... on counterterrorism.

President Trump is hardly the first U.S. president to call on the European allies to do more - in one form or another, every president since Harry Truman has done so. What is different this time, however, is Trump's suggestion that America's commitment to the alliance is conditional.

Syria is a signature to the Geneva Protocol of 1925, which bans the use of chemical warfare. Syria has violated that international norm. For the United States to act in response is the right thing to do, is a legitimate thing to do, and is necessary in order to uphold this very important international standard.

One of the amazing things about September 11 is that we lacked the imagination to connect the dots and foresee it.