The Electoral College met on December 14, 2020, to formally elect Biden and Kamala Harris as president and vice president. The results were to be certified by a joint session of Congress on January 6, 2021, but because of an attempt by Trump supporters to overturn the results by storming and vandalizing the Capitol building, the certification was not completed until January 7. Biden's transition ended when he was inaugurated at 12:00 p.m. EST on January 20, 2021, at which point his presidency began.