California Governor Gavin Newsom escalated his public feud with President Donald Trump on Wednesday, implying that the 79-year-old president may be showing signs of dementia because he “repeats false things over and over again.” The remark came in a social-media post hours after Trump, during a Cabinet meeting, mocked what he called Newsom’s “strange hand action.” Newsom responded, “You really want to have a conversation about hands?”—a pointed reference to persistent bruising seen on Trump’s right hand. The discoloration has fuelled online speculation about the president’s health, although the White House last month released a memo from physician Capt. Sean Barbabella attributing the marks to minor soft-tissue irritation caused by frequent handshaking and routine aspirin use. Trump, who has repeatedly labeled the Democratic governor “incompetent,” has not addressed the dementia insinuation. The exchange underscores the intensifying personal attacks between two of the country’s most prominent political figures as debate over the president’s fitness for office continues.