Watch: Donald Trump Jr booed off stage at UCLA book event — by members of the far right

An appearance by Donald Trump Jr. at UCLA was abruptly ended on Sunday when the son of President Donald Trump was attempting to promote his book "Triggered."

According to the LA Times, "Chanting 'humanity first," dozens of people protested outside the UCLA hall on Sunday where Donald Trump Jr. was speaking as part of a promotional tour for his new book."

Inside the hall, protesters chanted "America first," and then booed after Trump, TPUSA activist Charlie Kirk and Trump girlfriend Kimberly Guilfoyle refused to take questions.

According to the Guardian, "the appearance backfired when his own supporters, diehard Make America Great Again conservatives, raised their voices most loudly in protest and ended up drowning him out barely 20 minutes into an event scheduled to last two hours."

"At first, Trump and Guilfoyle tried to ignore the discontent, which originated with a fringe group of America Firsters who believe the Trump administration has been taken captive by a cabal of internationalists, free-traders, and apologists for mass immigration," The Guardian continued. "When the shouting would not subside, Trump Jr tried – and failed – to argue that taking questions from the floor risked creating soundbites that leftwing social media posters would abuse and distort. Nobody was buying that."

You can see clips from the event below via Twitter.