 A U.S. senator has joined a growing number of Democrats in the House of Representatives in calling for Joe Biden to step down from the American presidential race. Writing in the Washington Post newspaper, Peter Welch, who's from the state of Vermont, says Mr. Biden should withdraw his candidacy for the good of the country. Earlier, the former Democrat speaker, Nancy Pelosi, appeared to waver in her support for the president, suggesting he still had a decision to make.