Sen. John McCain John Sidney McCainThe electoral reality that the media ignores Kelly's lead widens to 10 points in Arizona Senate race: poll COVID response shows a way forward on private gun sale checks MORE (R-Ariz.) on Sunday said he is concerned with President Donald Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE’s recent memorandum that reorganizes the National Security Council (NSC).

“I am worried about the National Security Council,” McCain told CBS’s “Face the Nation.”

Trump on Saturday signed a memorandum that restructured the NSC, adding White House chief strategist Stephen Bannon to “the principals committee,” and removing the chairman of the Joint Chiefs of Staff and the director of national intelligence.

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According to the memorandum, the director of national intelligence and the chairman of the Joint Chiefs of Staff "shall attend where issues pertaining to their responsibilities and expertise are to be discussed."

McCain, who chairs the Senate Armed Services Committee, called Bannon's placement on the NSC a “radical departure from any national security council in history."

Bannon is the former head of Breitbart News. He joined Trump’s campaign last August as its chief executive.