At two rallies this weekend, Trump called the vice president “mentally impaired” in comments that were criticized by some members of his own party.

Former President Donald Trump said at a rally here Sunday that Vice President Kamala Harris should be “impeached and prosecuted” for her actions related to the southern U.S. border.

He argued that people were “murdered because of her action at the border, and thousands more will follow in rapid succession,” adding, “She should be impeached and prosecuted for her actions.”

Trump also lobbed personal attacks at Harris on Sunday, echoing comments at his rally the day Saturday, when he called Harris “mentally disabled” and “mentally impaired.”

With Harris at the top of the Democratic ticket and a tight race in the final stretch of the presidential campaign, Trump’s rhetoric has escalated.