The U.S. Chamber of Commerce, the Association of Corporate Counsel and other business groups in Washington have spoken out again in support of KBR Inc. as the government contractor tries to keep certain internal documents from a whistleblower.

The organizations told the U.S. Court of Appeals for the D.C. Circuit on Friday that KBR shouldn’t have to hand over papers to Harry Barko’s lawyers in his long-running False Claims Act case. In December, U.S. District Judge James Gwin in Washington ordered KBR to release paperwork the company argues is protected from disclosure under the attorney-client privilege. KBR’s lawyers then appealed the decision to the D.C. Circuit.