Tweeting furiously on Saturday, Donald Trump called out The New York Times for allegedly using a fake source in a report about the North Korea summit that may or may not be happening on June 12. The only problem: this so-called “phony source” very much exists, and his quotes had been taken from an in-person press briefing held in the White House.

The piece in question was published Friday, and dealt with the meeting between Trump and North Korea’s Kim Jong Un that was supposed to take place June 12—before Trump canceled the meeting on Thursday, then changed his mind again 24 hours later. The senior White House official told reporters that the meeting will almost certainly not happen on the previously agreed-upon June date, due to a lack of planning time.

“The Failing @nytimes quotes ‘a senior White House official,’ who doesn’t exist, as saying ‘even if the meeting were reinstated, holding it on June 12 would be impossible, given the lack of time and the amount of planning needed,’” Trump tweeted on Saturday. “WRONG AGAIN! Use real people, not phony sources.”

Reporters immediately hit back, explaining that the person quoted in the piece was very much real, and had spoken to reporters at the White House itself.

Some reporters identified the official as Matthew Pottinger, a senior adviser on the National Security Council.

Trump has previously criticized various news outlets for citing anonymous sources, calling them fake. In this case, the official’s statement directly contradicts what Trump had said about when the North Korea meeting would happen: “It could even be the 12th,” Trump said on Friday.