By Patricia Zengerle and Richard Cowan WASHINGTON (Reuters) -U.S. lawmakers accused then-President Donald Trump on Tuesday 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 his election loss. The House of Representatives select committee’s seventh hearing in five weeks focused on the attack by extremists on that day, including Oath Keepers and Proud Boys, two pro-Trump groups that investigators say helped plan the attack, as well as QAnon, a right-wing conspiracy theory movement. “The committee w…