The White House-congressional dispute over testimony on the firing of U.S. attorneys and the warrantless domestic spy program has intensified. Four Democratic members of the Senate Judiciary Committee want a special prosecutor to investigate whether Attorney General Alberto Gonzales committed perjury in testimony this week. Gonzales told the Senate panel Tuesday there was no internal White House dissension over the spy program’s legality. He also denied trying to pressure then-Attorney General John Ashcroft to sign off on the program as he lay recovering from major surgery in his hospital bed. Gonzales said their meeting dealt with other intelligence activities.