Harris campaigns in Wisconsin; Trump attends Al Smith's dinner

McConnell said in December 2020 that Trump's behavior after the presidential election was “beyond erratic” and that he had spread “allegations of voter fraud,” none of which have been proven.

McConnell was also concerned that Trump's actions would cost Republicans one or both Senate seats in Georgia, which Democrats ultimately won. “Not only is he – well, he's stupid and bad-tempered and can't even figure out his own best interests, and he's made that very clear,” he said.

Trump's behavior, McConnell continued, “just underscores the good judgment of the American people.” They simply had enough of the misrepresentations, the almost daily lies, and they fired him. And for a narcissist like him that's really hard to take, and so his behavior since the election is far worse than before because he has no filter at all now.”

When asked about the comments in the book, McConnell responded: “Whatever I've said about President Trump pales in comparison to what JD Vance, Lindsey Graham and others have said about him, but we're all on the same team now.” .” .”

McConnell endorsed Trump for president in March. NBC News has reached out to the Trump campaign for comment.