Joe Biden has spent the last several months laying out the reasons why it would be a terrible idea to give Donald Trump a second term in office—reasons that include everything from Trump’s assault on reproductive rights to his pledge to be a dictator only “on day one.” And on Wednesday, the president added another entry to the list: the fact that his opponent appears to have completely lost touch with reality.

Speaking to supporters at a fundraiser in San Francisco, Biden reportedly referred to Trump’s claim that he and Russian opposition leader Alexey Navalny—who recently died in an Arctic penal colony—had suffered similar treatment, with the president remarking, “Some of the things that this fellow’s been saying, like he’s comparing himself to Navalny and saying that—because our country’s become a communist country, he was persecuted, just like Navalny was persecuted. I don’t know where the hell this comes from.” Biden added: “I mean, if I stood here 10, 15 years ago and said any of this, you’d all think I should be committed. It astounds me.”