The word "unprecedented" is often used to describe Donald Trump's presidency. He's broken with convention repeatedly: from announcing tariffs on allies, to the suggestion that he wants to buy Greenland. But are these moves really without precedent? Or do Trump's politics echo that of 19th century US presidents, but with a more alarming twist?

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Guest: Nick Bryant

Host: Manveen Rana.

Producer: Emily Webb.

Clips: ABC News, CNBC, Niki Ashton Youtube, CBS News, New York Times, FOX, MSNBC, Ronald Reagan Presidential Foundation & Institute, NBC, Washington Post, BBC.

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