Updated at 2:23 p.m. ET Sunday Thousands of President Trump's supporters — four weeks after a similar protest — flocked to the nation's capital for a protest in support of the president and his false claims of a stolen election. By Saturday night, clashes between rallygoers and counterprotesters escalated into violence, with four people stabbed and 33 people arrested into Sunday morning. Nine people were transported to hospitals, according to Washington, D.C.'s Fire and EMS Department. Two of the nine were police officers with injuries that were not life-threatening. Several groups that attended last month's protest marched again on Saturday. Those included the Proud Boys, a self-proclaimed "Western-chauvinist" organization known for violent confrontations with left-wing protesters. It's considered a hate group by the Southern Poverty Law Center.