Supporters of U.S. President Donald Trump attack the United States Capitol to disrupt certification of the 2020 presidential election, resulting in five deaths and evacuation of the U.S. Congress.

Donald John Trump is an American politician, media personality, and businessman who is the 47th president of the United States. A member of the Republican Party, he served as the 45th president from 2017 to 2021.

On January 6, 2021, the United States Capitol in Washington, D.C., was attacked by a mob of supporters of President Donald Trump in an attempted self-coup, two months after his defeat in the 2020 presidential election. They sought to keep him in power by preventing a joint session of Congress from counting the Electoral College votes to formalize the victory of the president-elect Joe Biden. The attack was unsuccessful in preventing the certification of the election results. According to the bipartisan House select committee that investigated the incident, the attack was the culmination of a plan by Trump to overturn the election. Within 36 hours, five people died: one was shot by the Capitol Police, another died of a drug overdose, and three died of natural causes, including a police officer who died of a stroke a day after being assaulted by rioters and collapsing at the Capitol. Many people were injured, including 174 police officers. Four officers who responded to the attack died by suicide within seven months. Damage caused by attackers exceeded $2.7 million.

After Democratic nominee Joe Biden won the 2020 United States presidential election, Republican nominee and then-incumbent president Donald Trump pursued an unprecedented effort to overturn the election, with support from his campaign, proxies, political allies, and many of his supporters. These efforts culminated in the January 6 Capitol attack by Trump supporters in an attempted self-coup d'état. Trump and his allies used the "big lie" propaganda technique to promote false claims and conspiracy theories asserting that the election was stolen by means of rigged voting machines, electoral fraud and an international conspiracy. Trump pressed Department of Justice leaders to challenge the results and publicly state the election was corrupt. However, the attorney general, director of National Intelligence, and director of the Cybersecurity and Infrastructure Security Agency – as well as some Trump campaign staff – dismissed these claims. State and federal judges, election officials, and state governors also determined the claims to be baseless.