Donald Trump said Friday he was being sarcastic when he accused President Obama of being the “founder” of ISIS.

“Ratings challenged @CNN reports so seriously that I call President Obama (and Clinton) ‘the founder’ of ISIS, & MVP,” Trump wrote on Twitter. “THEY DON’T GET SARCASM?”

The tweet comes after days of the Republican presidential nominee doubling down to defend the provocative claim, which he made Wednesday at a rally in Florida.

Radio host Hugh Hewitt on Thursday asked Trump whether his claim that Obama founded ISIS meant he had “created the vacuum” that allowed for the terror group to rise up in the Middle East.

“No, I meant he’s the founder of ISIS,” Trump insisted in the radio interview. “I do. He was the most valuable player. I give him the most valuable player award. I give her, too, by the way, Hillary Clinton.”

Trump added, “He was the founder. The way he got out of Iraq was that that was the founding of ISIS, okay?”

Trump repeated the claim at multiple campaign events Thursday in Florida.