50501 (short for "50 protests, 50 states, 1 movement", originally an abbreviation of "50 protests, 50 states, one day") is a grassroots political organization founded to protest the policies and actions of the second Donald Trump administration in the United States.[3][4] The group organized a nationwide demonstration on February 5, 2025,[5][6] another nationwide "No Kings on Presidents Day" demonstration on February 17 (Presidents' Day),[7] and a third demonstration on March 4, 2025.[8][9] Thousands of people participated by gathering outside state capitol buildings and city halls during these protests.[10][7] On April 5, the movement again protested nationwide in what is one of the largest protests against the President.[11]