A woman wearing a Donald TrumpDonald TrumpHillicon Valley — Presented by Xerox — Twitter's algorithm boosts right-leaning content, internal study finds Ohio Democrat calls Vance an 'ass----' over Baldwin tweet Matt Taibbi says Trump's rhetoric caused public perception of US intelligence services to shift MORE for president jersey was cornered by dozens of protesters on Thursday and pelted with water bottles and eggs.

It was one of several incidents of violence at a rally for the presumptive GOP nominee in San Jose, Calif., the most disturbing scenes yet of increasingly frequent confrontations on the 2016 campaign trail.

NBC News reported that several Trump supporters were punched or chased as they left the event. Video showed protesters taking a red Trump hat from one man and setting it on fire.

San Jose Police Sgt. Enrique Garcia told NBC News that several protesters were arrested and one officer was assaulted in the melee, NBC reported.

John Podesta, Hillary ClintonHillary Diane Rodham ClintonI voted for Trump in 2020 — he proved to be the ultimate RINO in 2021 Neera Tanden tapped as White House staff secretary Meghan McCain: 'SNL' parodies made me feel like 'laughing stock of the country' MORE’s campaign manager, condemned the violence on Twitter.

Political commentator Mark Halperin of Bloomberg criticized police, questioning why they didn’t step in earlier. 

Law enforcement in the city "really dropped the ball," Halperin said.

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The incidents are likely to raise pressure on police in Cleveland, where the GOP is hosting its national convention this summer, to take additional steps for ready for big protests planned against Trump.