Donald Trump Assumes London’s Muslim Mayor ‘Denies That There’s Islamic Terrorism’

Donald Trump continued his war of words with newly-elected London mayor Sadiq Khan on Wednesday.

“Well, I assume he denies that there’s Islamic terrorism,” Trump said on Fox’s Kilmeade and Friends radio show. “I mean, if you look at this, there’s radical Islamic terrorism all over the world right now. It’s a disaster what’s going on. I assume he’s denying that. I assume he’s like our president that’s denying it’s taking place.”

Trump went on to say in the interview that Islamic extremism proves that his proposed ban on Muslim immigration is necessary.

“We have a serious problem. It’s a temporary ban,” Trump said, pointing to recent terror attacks in San Bernardino and Paris. “If they want to deny it, they can deny it. I don’t choose to deny it.”

The two have been going back and forth all week. Khan, the newly-elected first Muslim mayor of a major city, told TIME in an interview that he didn’t believe he would be allowed into America if Trump was elected.

Trump responded saying he would make an exception on a proposed Muslim ban for Khan, but the London mayor warned Tuesday that Trump’s “ignorant view of Islam” could prove a danger.

Khan does not deny the danger of Islamic extremism, telling TIME that he believes his unique experiences as a Muslim will help him combat extremism, especially among impressionable young Muslims.