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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 PowerObama's UN envoy apologizes for not recognizing Armenian mass killings as genocide New US approach to Syria a welcome sight to many in region Trump’s response to Syrian bloodshed lifts the stain of American inaction MORE will replace Rice as ambassador to the United Nations.

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