The Labor Department has added another attorney with a big law pedigree to the agency’s senior ranks.

Rachel Mondl, a former Gibson Dunn associate and Republican Capitol Hill staffer, is the DOL’s new deputy solicitor for policy, the department announced on its website.

While at the management-side firm Gibson Dunn, Mondl represented the U.S. Chamber of Commerce in a lawsuit challenging the fiduciary rule, which required retirement advisers to act in their clients’ best interests. After she left the firm, the Chamber’s case led the U.S. Court of Appeals for the Fifth Circuit to vacate the regulation in March.

After leaving Gibson Dunn, Mondl worked as a professional staff member and counsel for the House Education and the Workforce Committee’s GOP office. She received her law degree from Emory University in 2011, according to her Federalist Society bio.

Mondl now joins the team led by Kate O’Scannlain, the DOL solicitor and No. 3 overall official, that’s in the early stages of reviewing Obama-era policies for potential reversal or reconsideration. O’Scannlain recently told a private audience at the U.S. Chamber of Commerce that she’s planning on sending a memo that will direct her regional offices to apply the law consistent with Trump administration policies.

Mondl also arrives as the department is in the midst of losing three associate solicitors and one regional solicitor, who are all retiring within months.