Nixon refused to grant this request and his refusal led Dean to cooperate with the prosecutors very soon afterwards .
Dean had earlier asked Nixon for formal immunity from prosecution for any crimes he may have committed while serving as White House Counsel .
Nixon refused to grant this request and Dean 's refusal Dean Dean to cooperate with the prosecutors very soon afterwards .
Dean had earlier asked Nixon for formal immunity from prosecution for any crimes he may have committed while serving as White House Counsel .