The forever peevish Republicans on Capitol Hill have added a wicked new twist to our conduct of foreign policy. It’s called the Perfect Snowstorm, which is how Sen. John McCain excused himself and 46 other GOP senators for their lack of deliberation in signing the notorious Iran letter.

“It was kind of a very rapid process,” McCain said, inartfully. “Everybody was looking forward to getting out of town because of the snowstorm, I think we probably should have had more discussion about it, given the blowback that there is.”

McCain was even more diplomatic when he was first confronted […]