By Patricia Zengerle and Doina Chiacu WASHINGTON (Reuters) -U.S. lawmakers on Tuesday accused Donald Trump of inciting a mob of followers to attack the U.S. Capitol on Jan. 6, 2021, in a last-ditch bid to remain in power as Congress was formally certifying the then-president’s election loss. In video testimony shown by the House of Representatives committee investigating the riot, witnesses described a loud late-night six-hour meeting on Dec. 18, 2020, where Trump disregarded White House staffers who urged him to concede the November 2020 election to Democrat Joe Biden. Instead, Trump sided wi…