US-North Korea live updates: Trump taunts Kim Jong-un over nuclear button hours before Pyongyang reopens South Korea hotline

North Korea reopened its border hotline with South Korea hours after Donald Trump mocked Kim Jong-un by saying he has a "bigger and more powerful" nuclear button. The North Korean dictator ordered the hotline at the truce village of Panmunjom to be reopened at 6.30am. Officials from the two Koreas exchanged their names and examined their communications lines to make sure they were working during a 20-minute conversation, Seoul's Unification Ministry said.

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