Treasury Secretary Steve Mnuchin will soon lose two top aides as he finds himself pitted in a fight against House Democrats over their demand he release President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE’s tax returns.

Eli Miller, Treasury Department chief of staff and a former Trump campaign official, will leave the agency next week, according to a staffwide email obtained by The Hill.

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Mnuchin called Miller an instrumental leader “who has been constantly at my side, and he will be very difficult to replace” in a statement.

Assistant Secretary of the Treasury for Public Affairs Tony Sayegh also intends to leave the Treasury Department by the end of May and is interviewing candidates for his replacement, according to Politico.

Fox News commentator Monica Crowley is reportedly in the mix to replace Sayegh. She was tapped before Trump’s inauguration to serve on the National Security Council, but withdrew her nomination after reports surfaced about instances of plagiarism.

The Treasury Department declined to comment on Sayegh's reported departure to The Hill.

Miller was widely seen within the agency as a trusted aide to Mnuchin, accompanying the secretary to important meetings and liaising with lobbyists and business groups. However, staffers believed he prioritized his relationship with Mnuchin over managing the building or administration policy, according to Politico.

Sayegh played a top role in advertising the GOP’s signature tax cut legislation in 2017.

The news of the departures come as the administration appears headed to a court battle with House Democrats over their request for six years of the president’s tax returns.

Updated 8:45 p.m.