Former U.S. Secretary of State Mike Pompeo, former Director of National Intelligence John Ratcliffe and former U.S. Congressman Trey Gowdy have joined Oberheiden, the Dallas-founded federal litigation, compliance and corporate security defense firm said on Tuesday.

The hiring of the three Republican former office-holders may help the firm meet founder Nick Oberheiden’s vision to add more national security and congressional investigation matters to the firm’s docket of federal-court litigation.