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McCain's tweet on Wednesday came after the White House announced that Donilon was stepping down from his post and that Rice would replace him.

Former foreign policy adviser Samantha PowerSamantha Jane Power8 signs pointing to a counterintelligence operation deployed against Trump's campaign 115 former US ambassadors write Senate opposing Gina Haspel Trump expected to remove US from Iran nuke deal MORE will replace Rice as ambassador to the United Nations.

Obama will make the announcement at 2:15 p.m.