A top aide to Sen. Jeff Sessions Jefferson (Jeff) Beauregard SessionsTrump's policies on refugees are as simple as ABCs Ocasio-Cortez, Velázquez call for convention to decide Puerto Rico status White House officials voted by show of hands on 2018 family separations: report MORE (R-Ala.) is joining Republican presidential front-runner 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 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.