Karl was ordered to testify before the Senate Judiciary Committee . Karl 's lawyers say ` ` executive privilege '' makes him ` ` immune '' from subpoena . Congress is investigating whether Rove was involved in murders of U.S. Senators .
Karl Rove ordered to testify before the House Judiciary Committee . Rove 's lawyers say `` executive privilege '' makes him `` immune '' from subpoena . Panel is investigating whether Rove was involved in firing of U.S. attorneys .