[cnn-photo-caption image= http://i2.cdn.turner.com/cnn/2008/images/09/16/art.palin.9.14.jpg caption="Allies of Gov. Palin are asking for a judge to half the trooper probe."]
ANCHORAGE, Alaska (CNN) - Allies of Alaska Gov. Sarah Palin asked a judge Tuesday to halt the state Legislature's investigation into the firing of her public service commissioner, calling the probe a "McCarthyistic" inquisition.
The five Republican state lawmakers who filed suit say the leaders of the investigation "are unable to hold the balance between vindicating their own political interests and the interests of those who are being investigated."
Palin, the Republican nominee for vice president, is battling allegations that she and her advisers pressured then-Public Safety Commissioner Walt Monegan to fire a state trooper going through a bitter custody dispute with her sister - and that Monegan was terminated when he refused. Palin says she fired Monegan over budget issues, and denies any wrongdoing.
She originally pledged to cooperate with the investigation that a bipartisan commission of the state Legislature commissioned in July. But since becoming Sen. John McCain's running mate, campaign spokesmen have lashed out at the probe as "tainted" and "partisan."