President Trump replaces US National Security Adviser HR McMaster with Bush-period defense peddle John Bolton.
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In a tweet, Mr Trump said he was grateful for Mr McMaster's administration and said he had completed an "outstanding job".
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He is the most recent in a progression of prominent takeoffs from the White House.
A week ago, Mr Trump let go Secretary of State Rex Tillerson through Twitter, supplanting him with previous CIA Director Mike Pompeo.
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