evidence: Walz depicted Trump as wrong on the issues and a chaotic leader. Vance rebuffed him with every answer and made the case for the man he once heavily criticized. [...] Walz, meanwhile, was pressed on his misleading claim, which was investigated this week by Minnesota Public Radio and other outlets, that he was in Hong Kong during the turbulence surrounding the 1989 Tiananmen Square massacre, part of a broader pattern of inaccuracies that Republicans hope to exploit. Confronted with his misstatements about his travels to China years ago, Walz defended himself by saying, "I’ve not been perfect." In fact, he said, "I’m a knucklehead at times." Eventually, he acknowledged he misspoke about his history.