The Saturday rally, titled "Justice for J6," aims to protest the arrest of hundreds of rioters in the wake of the Jan. 6 Capitol attack.
Earlier on Monday, Capitol Police officers arrested a 44-year-old man for allegedly possessing a bayonet and a machete outside the Democratic National Committee headquarters, which sits just south of the Capitol building, according to a report by The Hill. Both items are illegal in Washington.
Some 140 police officers were reportedly injured when confronting a mob of Trump supporters who breached the Capitol on Jan. 6 in an attempt to stop Congress from certifying the 2020 election results for President Joe Biden.
The Capitol riot, later deemed an insurrection, left five dead, including a Capitol Police officer.