Donald Trump Jr. defended Chelsea Clinton against accusations she helped to spark the New Zealand mosque massacres by spreading anti-Muslim sentiment.

On Friday, tensions boiled over when Clinton was accosted by a New York University student who attempted to publicly shame her for “all the Islamophobia that you have stoked.” According to The New York Post, Clinton was attending a vigil on the campus for the 49 people killed in the attacks earlier that day.

Footage of the incident surfaced on Twitter, showing the interaction in which she can be seen calmly addressing the student.

“I’m so sorry,” she said. “Certainly it was never my intention. I do believe words matter.”

Still, the student persisted in dressing down Clinton, claiming the shootings were “stoked by people like you.”