Did Trump lose the 2020 presidential election?

Context: Trump lost the 2020 presidential election to Joe Biden but refused to concede defeat, falsely claiming widespread electoral fraud and attempting to overturn the results by pressuring government officials, mounting scores of unsuccessful legal challenges, and obstructing the presidential transition. On January 6, 2021, Trump urged his supporters to march to the U.S. Capitol, which many of them then attacked, resulting in multiple deaths and interrupting the electoral vote count.

Answer: Yes. Trump lost the 2020 presidential election, but refused to concede defeat. He furthermore urged his supporters to commit insurrection and attack the U.S. Capitol on January 6th 2021.