The conspiracy theory that President Donald Trump pushed Monday that a plane “almost completely loaded with thugs” had been set to disrupt the Republican National Convention was almost identical to a rumor that went viral on Facebook three months ago.

In an interview with Fox News host Laura Ingraham, Trump claimed that “we had somebody get on a plane from a certain city this weekend, and in the plane it was almost completely loaded with thugs, wearing these dark uniforms, black uniforms, with gear and this and that.”

He then claimed the matter was “under investigation right now.”

There is no evidence of any such flight. When Ingraham asked for more information about the flight, the president said, “I’ll tell you sometime.” He then alleged the people had been headed to Washington to disrupt the RNC.