The idea that a country can't increase the size of its territory by taking it over another has been a principle of Western foreign policy for decades. If that changes it will be a profound shift. "Once that genie's out of the bottle, it will be very hard to put back in", says Tom Wright, the Irishman who was a member of Joe Biden's National Security Council and is now a senior fellow at the Brookings Institution, a foreign policy think-tank. He talks to Hugh about foreign policy under Biden and Trump.

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