The American Civil Liberties Union said over 5 million people participated in protests against the Trump administration on June 14.

A crowd-size expert from the U.K. estimates that between 10,000 to 15,000 people attended Saturday's protest in downtown Chicago. But some estimates say 75,000 people gathered downtown.

Calculating crowd size can be a challenge, and estimates for both Trump’s parade and ‘No Kings’ protests vary widely.

A huge and peaceful crowed turned out for the "No Kings" rally, shutting down much of the Loop as part of a nationwide protest movement to denounce the Trump administration.

Despite peaceful demonstrations reported in multiple cities, violence flared at some anti-Trump protests over the weekend.

Thousands gathered outside Flagstaff City Hall Saturday for the "No Kings" event. Numerous other demonstrations took place across Arizona with nearly 2,000 nationwide in protest of the Trump administration's policies.

Joseph R. Checklick Jr. was arrested after police said he intentionally drove into protesters in Culpeper, Virginia on June 14.

Greenville Police say there is no official crowd estimate at the moment. Bella Carpentier 11:37 a.m. Protest crowds exceed 5,000 Protest crowds exceed 5,000 as demonstrators gather at Unity Park to support veterans and protest against Trump administration policies.