GOP senator's aide joins Trump campaign
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A top aide to Sen. Jeff SessionsJefferson (Jeff) Beauregard SessionsThe 'pitcher of warm spit' — Veepstakes and the fate of Mike Pence FBI officials hid copies of Russia probe documents fearing Trump interference: book Tuberville breaks DC self-quarantine policy to campaign MORE (R-Ala.) is joining Republican presidential front-runner Donald TrumpDonald John TrumpJoe Arpaio loses bid for his old position as sheriff Trump brushes off view that Russia denigrating Biden: 'Nobody's been tougher on Russia than I have' Trump tees up executive orders on economy but won't sign yet MORE's campaign, according to a new report.

Stephen Miller, who served as Session's communications director, will join Trump's campaign Wednesday as a senior policy adviser, The Washington Post reports.

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Trump continues to dominate in the GOP presidential race a week out from the first ballots being cast in the Iowa caucuses.

The businessman has boasted of relationship with Sessions, who hasn't yet endorsed a candidate but appeared at a Trump rally in Mobile, Ala., in August.

Sessions, whom Trump consulted on his immigration proposal, briefly wore one of the candidate's "Make America Great Again" hats at the rally before making remarks.

Miller will work alongside Trump's chief policy adviser Sam Clovis to draft white papers and aid the candidate as he prepares for the Thursday night GOP debate, according to the Post.