Demonstrators at UC-Berkeley forced the administration to cancel a speech by reactionary gadfly Milo Yiannopoulos, prompting President Trump to threaten the school's federal funding in an angry Tweet.

Senior editor for Breitbart News, and blatant racist and misogynist, Milo Yiannopoulos was shut out of his UC Berkeley talk when over a thousand protesters showed up to protest, including a few violent agitators.

His visit to Berkeley was sponsored by the campus Republican club.

The event was canceled an hour later, at 6pm, or two hours before Yiannopoulous was slated to go on. He also hired Steve Bannon, a former Breitbart executive with ties to white nationalism, to be one of his top advisers.

Trump's warning comes amid similar ultimatums to "sanctuary cities", localities that effectively shield undocumented immigrants from deportation by refusing to cooperate with federal immigration authorities.

Though Yiannopoulos left the campus at around 6 p.m., according to police, riots continued and the university was on lockdown till about 11 p.m. The university called off the event after masked protesters set fires and began throwing rocks through windows on the campus. The entire University of California system receives about $8.5 billion federal funding annually.

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Several injuries and acts of vandalism were reported Wednesday night on campus as well as in various parts of the city of Berkeley. An estimated 500 people gathered, holding signs that say "Hate Speech Is Not Free Speech" and pledging to shut down the event. He was banned from Twitter after leading a harassment campaign against Ghostbusters actress Leslie Jones.

Yiannopoulos is the senior editor of Breitbart News, the "alt-right" news outlet that supported Trump throughout his presidential election campaign previous year and which has been accused of propagating "fake news" with its fervently anti-immigration agenda.

UC Berkeley's administration also came out with a statement on the matter.

UC Davis interim Chancellor Ralph Hexter said he was "deeply disappointed" by the protests and the cancellation.

One person was shot and wounded at a Yiannopoulos speech at the University of Washington last month.