updated 10/6/2008 2:55:51 PM ET 2008-10-06T18:55:51

Alaska Republicans are asking the state's highest court to block an abuse-of-power investigation into vice presidential nominee Sarah Palin's firing of a state commissioner before a potentially embarrassing report on the matter is released.

Five GOP state lawmakers, in a brief filed Monday, say the inquiry has exceeded its authority and is too political.

Palin is the focus of a legislative investigation into allegations she abused her power by firing her public safety commissioner. The commissioner says he was pressured to dismiss a state trooper who was involved in a messy divorce with Palin's sister.

Investigators are scheduled to submit a report on the investigation Friday. Oral arguments are scheduled for Wednesday.

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