London Mayor Sadiq Khan, who has publicly feuded with President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE, is warning of the global implications if Trump is reelected in 2020.

In an interview at Advertising Week Europe on Wednesday, Khan, a member of the Labour Party, predicted that Trump will not be reelected but suggested that he doesn’t think anyone currently in the race will beat him.

“I think the next president hasn’t declared yet,” Khan said, according to the London Evening Standard. “I think it’s not going to be Trump. It can’t be Trump. Jeez!” he added, according to the paper.

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Khan reportedly said Trump “amplified messages of hate” and that he hopes Americans who opted out of voting in 2016 will work to defeat him in the upcoming election.

“What happens in America matters for the rest of the world,” Khan said, according to the Standard. “I’m hoping those Americans who didn’t get involved in the last campaign get involved, get registered.”

“Who the president is affects not just American citizens. It affects all of us,” he added.

Trump has criticized Khan on a number of occasions over his handling of terrorism in the city.

Khan has spoken out against Trump, asking Prime Minister Theresa May to cancel the president’s visit to the U.K. in 2018 after Trump retweeted violent, anti-Muslim videos from a British ultranationalist leader.

Khan also allowed a blimp in the form of a baby Trump to fly over London during protests over Trump’s visit.