McCain 'disagrees' with Rice appointment but vows to work with her

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 PowerFormer Portuguese leader, refugee chief primed to be new UN head Dem urges support for UN human rights resolution on Yemen Obama’s November surprise MORE will replace Rice as ambassador to the United Nations.

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