It remains to be seen how long the truce will hold and whether it will pave the way for a nuclear deal between the U.S. and Iran.

"We have two countries that have been fighting for so long, they don't know what the f-ck they're doing," Trump said.

As night fell in the Middle East today, a cease-fire between Israel and Iran seemed to be holding. There was no evidence that either side had launched attacks in recent hours, and leaders in both countries said their side had prevailed in the 12-day war.