President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE is expected to tap Charles Rettig, a California tax attorney, as his new IRS commissioner, according to a Politico report.

It's not clear when exactly the nomination will come, though it is expected to come soon, Politico reported.

Rettig, a lawyer at Beverly Hills-based law firm Hochman, Salkin, Rettig, Toscher & Perez PC, specializes in tax controversy and has represented clients before the IRS, the Justice Department's tax division and numerous state taxing authorities.

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He previously served as the chair of the IRS Advisory Council, which advises the IRS on tax administration issues and reviews existing tax policy.

The IRS is currently being helmed by David Kautter, who has served as the agency's acting director since November.