Minnesota Gov. Tim Walz, the Democratic vice presidential nominee, compared former President Trump’s Sunday rally at New York’s Madison Square Garden in to a 1939 pro-Nazi event.

“Donald Trump’s got this big rally going at Madison Square Garden,” Walz said at an event in Henderson, Nev. “There’s a direct parallel to a big rally that happened in the mid-1930s at Madison Square Garden.”

An American Nazi Party held a rally at Madison Square Garden in February 1939 that lured 20,000 supporters to the iconic New York City landmark.

“And don’t think that he doesn’t know for one second exactly what they’re doing there,” Walz said.