Donald Trump has suggested new London Mayor Sadiq Khan would be exempt from his proposed ban on Muslims entering the US.
It comes after Mr Khan said any visit to see counterparts in New York and Chicago would have to be made before the presidential inauguration in January - in case Trump makes it to the White House.
The billionaire sparked global outrage when he proposed the temporary ban on Muslims entering America following the Paris terror attacks.
David Cameron branded the idea "stupid" and a petition to ban Trump from entering the UK raised nearly 600,000 signatures.
Commenting on Khan's mayoral win, Trump told the New York Times: "I was happy to see that. I think it's a very good thing, and I hope he does a very good job because frankly that would be very, very good."
Khan told Time magazine he was confident Mr Trump's approach to politics would not prevail when America goes to the polls in November.