President-elect Donald Trump on Sunday chose Reince Priebus, the chairman of the Republican National Committee and a loyal campaign adviser, to be his White House chief of staff, turning to a Washington insider whose friendship with the House speaker, Paul D. Ryan, could help secure early legislative victories.
In selecting Mr. Priebus, Mr. Trump passed over Stephen K. Bannon, a right-wing media provocateur.
But the president-elect named Mr. Bannon his senior counselor and chief West Wing strategist, signaling an embrace of the fringe ideology long advanced by Mr. Bannon and of a continuing disdain for the Republican establishment.
The dual appointments â€” with Mr. Bannon given top billing in the official announcement â€” instantly created rival centers of power in the Trump White House.
Mr. Bannonâ€™s selection demonstrated the power of grass-roots activists who backed Mr. Trumpâ€™s candidacy.
Some of them have long traded in the conspiracy theories and sometimes racist messages of Breitbart News, the website that Mr. Bannon ran for much of the past decade.
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