If Bush thinks, because of Clinton's actions, the office of the Presidency will take a direct hit resulting in permanent loss of public confidence, etc. -- he'll slam the door on open hearings. It's about honoring the Presidency, not Clinton per se.
Bush senior had the goods on Clinton when he ran for reelection, but refused to use it for the same reason...also thanks to Perot, we endured 8 years of horror. The list is endless,(Somalia, The Cole, Embassy bombings, bin Laden, Al Qaeda and 9/11... Clinton is a gift that keeps on giving -- Son of Clinton/quasi...Hill) Appalling.
It's also CYA time for high office govt. employees.