WASHINGTON—House Speaker Nancy Pelosi (D-Calif.) on Tuesday called for a U.S. diplomatic boycott of the 2022 Winter Olympics in Beijing, criticizing the Chinese regime for human rights abuses and saying global leaders who attend would lose their moral authority. U.S. lawmakers have been increasingly vocal about an Olympic boycott or venue change, and have lashed out at American corporations, arguing their silence about what the State Department has deemed a genocide of Uyghurs and other ethnic minorities in China was abetting the Chinese regime. Pelosi, a Democrat, told a bipartisan congressional hearing on the issue that heads of state around the world should shun the games, scheduled for February. “What I propose—and join those who are proposing—is a diplomatic boycott,” Pelosi said, in which “lead countries of the world withhold their attendance at the Olympics.” “Let’s not honor the Chinese government by having heads of state go to China,” she …