R&B singer John Legend described GOP presidential frontrunner Donald Trump as “racist” during a Twitter exchange with Donald Trump Jr. on Friday.

Trump Jr., who is an executive vice president at The Trump Organization in addition to being an active campaigner for his father, took to Twitter on Friday evening as swarms of violent leftist protesters shut down a planned Trump event in Chicago.

The younger Trump noted, “5 students when asked why they were protesting couldn’t even answer. The participation medal/micro aggression generation is pretty sad!”

He later tweeted: “It’s pretty embarrassing. Trump supporters were articulate and the antis could barely speak and had no answers.”

Legend responded: “@DonaldJTrumpJr I think they were protesting your racist father. This isn’t complicated.”

Trump then replied: “Here we go again. That can’t be the answer for everything you don’t like. That’s why the country is so divided now!”

Legend fired back, “It’s just the answer when racist racists are saying racist s—t and are endorsed by the KKK.”

Legend then wrote that he graduated from the same school — the University of Pennsylvania — as both Trump and Trump Jr.

Legend was among a group of at least a dozen influential entertainers who took to social media to blame Trump and his supporters for the violence outside of Friday’s cancelled rally.

Many of the anti-Trump protesters later took to Twitter to claim victory for shutting down the event.

A statement released by the Trump campaign explained the cancellation: “Mr. Trump just arrived in Chicago and after meeting with law enforcement has determined that for the safety of all of the tens of thousands of people that have gathered in and around the arena, tonight’s rally will be postponed to another date.”

Trump also thanked his supporters for showing up and urged them to “please go in peace.”