Hassan was in the Senate chamber on January 6, 2021, for the 2021 United States Electoral College vote count when Trump supporters stormed the U.S. Capitol. After the Capitol was breached by rioters, Hassan, along with staff and other senators, was removed from the chambers to an undisclosed location. Hassan called the event traumatizing, calling it an "insurrection" and "one of the grimmest days in the history of our country." The following day, she called for Trump to resign, calling him "unfit for office". She also called for an investigation into the lack of security, poor law enforcement response, and how law enforcement treated the Trump supporters, which contrasted with the treatment of Black Lives Matter protestors.