The Federal Reserve’s Board of Governors has enlisted former special counsel Robert Hur to help defend the central bank against Justice Department subpoenas targeting Fed Chairman Jerome Powell, according to court filings unsealed Friday that revealed a federal judge blocked the government’s demands for records.

Hur, a former U.S. attorney who investigated former President Joe Biden’s handling of classified documents, has been working as part of the Federal Reserve’s legal team as the central bank moved to quash subpoenas tied to a criminal investigation into renovations of the Fed’s Washington headquarters.