London Mayor Sadiq Khan is a bit confused about why President Trump has a "beef" with him.

"I'm a reluctant participant in this dialogue with Donald Trump, because I'm trying to be a full-time mayor doing my job, and I'm not sure what he and his son have against me, and why they are tweeting about me," Khan said in an interview with the Guardian published Saturday.

"We're not schoolchildren. He's the president of the United States, so I'm unclear what his beef is with me," he added.

Khan found himself in Trump's crosshairs in early June, following a terrorist attack in London. In particular, it was a interview he did with the BBC that caught Trump's attention: He said, "There's no reason to be alarmed," while talking about how police were on the scene in response to the attack.

Trump criticized that comment in a tweet: "At least 7 dead and 48 wounded in terror attack and Mayor of London says there is ‘no reason to be alarmed'!" After Khan claimed Trump took his comment out of context, Trump fired back that it was a "pathetic excuse" and accused the mainstream media of "working hard to sell it." Trump's sons, Donald Trump Jr. and Eric Trump, later came to their father's defense.

Khan also said the British government should refuse to "roll out the red carpet" for President Trump and cancel any future state visits.

When asked by the Guardian if the trouble with Trump might stem from him being Muslim, Khan replied, "Well, if that's the case, it says more about him than me."

"Look, it's perfectly possible to be an American or a Brit and a Muslim," he continued. "They are not mutually exclusive, and for anybody to think that – I can't understand it, not for people who hold important power."