It should come as no surprise that when Bernie Sanders stopped by Conan on Tuesday night, the two found themselves talking about Donald Trump’s tweets. In lieu of a traditional press pool, it seems more and more that our future presidential dispatches might come in 140 characters or less. Recently, the president-elect said that Hillary Clinton only won the popular vote because of widespread voter fraud. Sanders’s assessment of that?

“First of all, it’s delusional,” Sanders said. “It’s totally insane. Nobody believes that who studies elections or election patterns.”

But Sanders noted another possible motivation—one Twitter users were quick to point out: “What he’s saying is, ‘We have got to suppress the vote. We have got to make it harder for poor people, people of color, immigrants, elderly people to participate, because they may be voting against us.’”

Sanders also responded to Trump’s tweet saying that those who burn the American flag in protest should “perhaps” lose their citizenship or go to jail, noting that it’s a message to dissenters to watch their backs.