In its latest move gearing up for a round of congressional investigations, the U.S. House Judiciary Committee announced Tuesday that it retained Barry Berke and former Obama White House ethics lawyer Norman Eisen as consultants for the panel.

Rep. Jerrold Nadler, who chairs the House Judiciary Committee, said Berke and Eisen would work as special oversight counsels, consulting lawmakers in their oversight of the U.S. Justice Department, special counsel Robert Mueller III’s investigation into Russian interference in the 2016 U.S. election, and other matters that fall within the panel’s purview.