Trump lost the 2020 presidential election to Biden but refused to concede. Attempting to overturn the results, he falsely claimed electoral fraud, pressured government officials, mounted scores of unsuccessful legal challenges and obstructed the presidential transition. On January 6, 2021, Trump urged his supporters to march to the Capitol, which hundreds stormed, interrupting the electoral vote count. The House impeached Trump for incitement of insurrection on January 13, making him the only federal officeholder in American history to be impeached twice. The Senate acquitted Trump for the second time on February 13, after he had already left office.