Donald Trump Jr and his girlfriend, Kimberly Guilfoyle, were forced to cut short a launch event for his book, Triggered: How the Left Thrives on Hate and Wants to Silence Us, at the University of California, Los Angeles, because of loud booing from the audience.

The audience was angry that Trump Jr and Guilfoyle would not take questions.

Trump Jr tried to argue that taking questions risked creating soundbites that leftwing social media posters would distort