The House of Representatives of the 117th U.S. Congress adopted one article of impeachment against Trump of "incitement of insurrection", alleging that he had incited the January 6 attack of the U.S. Capitol. These events were preceded by numerous unsuccessful attempts by Trump to overturn the 2020 presidential election, as well as his pushing of voter fraud conspiracy theories on his social media channels before, during, and after the election. A single article of impeachment charging Trump with "incitement of insurrection" against the U.S. government and "lawless action at the Capitol" was introduced to the House of Representatives on January 11, 2021. The article was introduced with more than 200 co-sponsors. The same day, House Speaker Nancy Pelosi gave Vice President Mike Pence an ultimatum to invoke Section 4 of the 25th Amendment to assume the role of acting president within 24 hours, or the House would proceed with impeachment proceedings. Pence stated that he would not do so in a letter to Pelosi the following day, arguing that to do so would not "be in the best interest of our Nation or consistent with our Constitution". Nevertheless, a House majority, including one Republican, passed a resolution urging Pence to invoke the 25th Amendment.