Agents, some heavily armed and carrying zip ties, arrested “a few” people outside the event, Newsom spokesperson Izzy Gardon said. Video posted online showed one man in handcuffs being led away.

Leading the action was Gregory Bovino, head of the Border Patrol’s El Centro sector, which has aggressively touted its anti-immigrant stance on social media and is under a court injunction blocking the agency from indiscriminately arresting people based on their appearance or location.