The event was one of more than 2,000 “No Kings” rallies held across the country on Saturday, protesting what organizers call “authoritarianism, billionaire-first politics, and the militarization of our democracy.

The Philadelphia protest is something of a flagship demonstration amid nationwide actions as Trump holds a controversial military parade in Washington, D.C.

The demonstrations follow more than a week of large-scale protests in Los Angeles against Mr. Trump’s immigration crackdown and his decision to deploy the military there. Protesters gathered in Liberty Plaza outside of the Georgia State Capitol in Downtown Atlanta.

In Los Angeles, hundreds of protesters have now gathered by the federal building in downtown, where dozens of service members are standing guard with shields. Choruses of “Shame on you,” “Traitors” and “Marines out of LA” resound from the street.

Protesters in downtown Los Angeles vandalized at least five Waymo vehicles, setting at least two of them on fire, amid a chaotic demonstration against immigration raids. The activists spray-painted anti-Trump and anti-ICE slogans on the self-driving cars before igniting two of them.