GOP presidential candidate Donald Trump claimed the father of his rival Sen. Ted Cruz (R-TX) helped Lee Harvey Oswald kill President John F. Kennedy.

“His father was with Lee Harvey Oswald prior to Oswald’s being — you know, shot. I mean, the whole thing is ridiculous,” he told Fox News. “What is this, right prior to his being shot, and nobody even brings it up. They don’t even talk about that. That was reported, and nobody talks about it.”

No one holds any evidence to prove this claim. The National Enquirer, whose publisher is close friends with Trump, says they hold pictures that show Cruz’s father with Oswald.

People have already brushed aside the accusations, including Cruz.

As Andrew Kirell at The Daily Beast points out, Brian Kilmeade tried to tell Trump no one could verify the report, but immediately backed down when the frontrunner kept talking over him.

“I mean, what was he doing?” exclaimed Trump. “What was he doing with Lee Harvey Oswald shortly before the death? Before the shooting? It’s horrible.”