On Dec. 22, just weeks from taking office, then President-elect Donald Trump shook the military and nuclear communities by tweeting out that the U.S. “must greatly strengthen and expand its nuclear capability until such time as the world comes to its senses regarding nukes.”

It was a stunning statement, as the push to limit expansion of atomic arms has been a cornerstone of American policy since the height of the Cold War. But Trump doubled down the next day. Continue Reading.