As a general matter, if the president wants to withdraw from a treaty, he simply gets to do that. And that's part of the powers of the office.
Benjamin WittesTrump fired Jim Comey because the most dangerous thing in the world, if you are Donald Trump, is a person who tells the truth, is dogged, you can't control, and who is as committed as Comey is to the institutional independence of an organization that has the power to investigate you.
Benjamin WittesComey really spent an enormous amount of energy in the period in which both he and Trump were in office trying to protect the FBI from political interference from the White House.
Benjamin Wittes