evidence: January 6 U.S. Capitol attack [...] January 6 U.S. Capitol attack, storming of the United States Capitol on January 6, 2021, by a mob of supporters of Republican Pres. Donald J. Trump. The attack disrupted a joint session of Congress convened to certify the results of the presidential election of 2020, which Trump had lost to his Democratic opponent, Joe Biden. Because its object was to prevent a legitimate president-elect from assuming office, the attack was widely regarded as an insurrection or attempted coup d’état. The Federal Bureau of Investigation (FBI) and other law-enforcement agencies also considered it an act of domestic terrorism. For having given a speech before the attack in which he encouraged a large crowd of his supporters near the White House to march to the Capitol and violently resist Congress’s certification of Biden’s victory—which many in the crowd then did—Trump was impeached by the Democratic-led House of Representatives for "incitement of insurrection" (he was subsequently acquitted by the Senate).