GOP senator's aide joins Trump campaign
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A top aide to Sen. Jeff SessionsJeff SessionsGrassley: Comey must say if FBI investigated Sessions Gingrich: Media was right, special elections were a referendum Overnight Regulation: Labor groups fear rollback of Obama worker protection rule | Trump regs czar advances in Senate | New FCC enforcement chief MORE (R-Ala.) is joining Republican presidential front-runner Donald TrumpDonald TrumpTrudeau calls Trump tweets a 'new wrinkle in international diplomacy' Poll: Half want Dems to control Congress after 2018 To resist Trump’s climate assault, California must curb oil production 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.

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.