WASHINGTON (Reuters) – A large restructuring of the White House National Security Council got under way on Friday as President Donald Trump moved to reduce the size and scope of the once-powerful agency, five sources briefed on the matter said.

Staff dealing with a variety of major geopolitical issues were sent termination notices on Friday, said the sources, who requested anonymity as they were not permitted to speak to the media.

The move comes just weeks after Secretary of State Marco Rubio took over from Mike Waltz as national security adviser. The NSC declined to comment.

The restructuring of the NSC is expected to grant more authority to the State Department, the Defense Department and other agencies, the sources said. The aim is to reduce the size of the NSC to just a few dozen people.

The NSC is the main body used by presidents to coordinate national security strategy. Its staff often make key decisions regarding America’s approach to the world’s most volatile conflicts and play a key role in keeping America safe.

The firings will reduce the NSC’s already pared-down staff. The body had more than 300 staffers under Democratic President Joe Biden, but even before the recent firings under Trump was less than half the size of Biden’s NSC.

The NSC staffers who are cut from the agency will be moved to other positions in government, two of the sources told Reuters.

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(Reporting by Steve Holland and Gram Slattery; Editing by Colleen Jenkins and Leslie Adler)