Donald Trump loves few things more than tackling a new political foe. But has he met his match in New York's incoming mayor Zohran Mamdani?

The mouthwatering showdown between the Republican and the young Democratic socialist could define the next phase of Trump's presidency.

Trump has appeared to relish having Mamdani as a foil, branding him a communist, mocking the name of the first Muslim and South Asian to lead America's largest city, and threatening to cut federal funding for New York City.

But his rival has shown he can play Trump at his own game.

It's rare for former reality TV star Trump to see himself upstaged, but 34-year-old Mamdani managed it at his victory rally on Tuesday night.

"Donald Trump, since I know you're watching, I have four words for you -- turn the volume up!"

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