Trump refused to accept the results; he and his allies made claims of fraud, pressured elections officials, filed dozens of lawsuits (all of which were struck down by the courts), and directly attempted to overturn the results at the county, state, and federal level. This culminated in the January 6, 2021, attack on the United States Capitol, for which Trump was impeached a second time. The day after the attack, Trump formally conceded the election without mentioning president-elect Biden by name, in a video posted on Twitter.