Michele Kelemen

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Updated at 8:08 p.m. ET

President Trump has chosen John Bolton, a hawk on North Korea and Iran, to be his next national security adviser.

The appointment comes just as those two foreign policy challenges come to a head.

Bolton replaces H.R. McMaster, who Trump said Thursday via Twitter is leaving the administration. Bolton takes over from McMaster effective April 9, the president also said.

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Here's something else President Trump said today about a possible opening for diplomacy with North Korea.

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