text:  Lloyd Doggett has become the first Democrat in Congress to call for Mr Biden to withdraw from the race for the White House. He said too much was at stake to risk what he called an authoritarian takeover by a criminal and his gang. The former U.S. House Speaker, Nancy Pelosi, said discussions about Mr Biden's mental health were legitimate. And in a video statement, Democratic Party congressional candidate in Colorado, Adam Frisch, also called on Mr Biden to step aside.