President Trump on Friday offered his apology for retweeting a video from a far-right British activist that angered the United Kingdom last year.

In an interview with Piers Morgan, Trump said he didn't know who the activist was at the time.

"I don't want to be involved with these people," Trump said. "If you're telling me they're horrible racist people... I certainly apologize."

The anti-Muslim video Trump retweeted was made by Jayda Fransen, one of the leaders of the British nationalist movement Britain First.

The retweet angered many in the U.K. and led Prime Minister Theresa May to blast Trump over Twitter.