John Oliver warns Trump's crude swipe at Obama is about to backfire spectacularly

Comedian John Oliver warned Sunday that President Donald Trump's profane attack on Barack Obama is going to come back to haunt him.

On "Last Week Tonight," the HBO host zeroed in on Trump's G7 appearance in France, where the president, seated beside Egyptian leader Abdel Fattah el-Sisi, mocked Obama's 2015 nuclear deal, which Trump tore up in his first term, and claimed Iran once "laughed at Obama" and called him "a stupid son of a b----" over a $1.7 billion payment.

Oliver pointed out that Trump's own memorandum of understanding commits Iran to receiving at least $300 billion in reconstruction aid.

“If Iran called Obama a stupid son of a b---- for letting them get $1.7 billion, I think we’re about to find out what the Persian word is for someone 300 times dumber than that,” Oliver quipped.

The host argued the agreement is "less a comprehensive peace deal and more a plan to eventually have one, with some pretty big holes in it," noting it "doesn’t even address Iran’s nuclear program—supposedly the whole point of this war in the first place.” He also flagged that the deal has been criticized within Trump's own party.

Even as Trump keeps boasting that his deal beats the one Obama struck in 2015, the former president gave his own verdict in an NBC interview that aired Friday.

“We’ve now fought a war, spent billions and billions of dollars, you know, put enormous strain on our military, a lot of people have died, and it feels like we’re back where we were before we started the war,” Obama said. “Except maybe a little bit worse.”