The 59-year-old has been an Air Force reservist and made numerous trips to Iraq and Afghanistan as a Senator. He saw early how Mr. Obama’s abdications in Syria and Iraq would lead to greater disorder, and he’s had Vladimir Putin’s number since the Bush Administration.

Mr. Graham deserves particular credit for sticking to his convictions in Mr. Obama’s first term, when the political fashion was to say the U.S. was “war-weary.” Mr. Obama claimed “the tide of war is receding” and many Republicans and conservative pundits became anti-interventionists of convenience. Mr. Graham was among those warning that the President’s policy of disengagement was storing up danger, and he was right.