ANCHORAGE, Alaska (CNN) -- Allies of Alaska Gov. Sarah Palin stepped up attacks on state lawmakers investigating the firing of her public service commissioner Tuesday, calling it a "McCarthyistic" inquisition and asking judges to block the probe.

The five Republican state lawmakers who filed suit said the two Democrats and the former Anchorage prosecutor leading the probe "are unable to hold the balance between vindicating their own political interests and the interests of those who are being investigated."

One of those named in the lawsuit, state Sen. Kim Elton, declined comment Tuesday. There was no immediate response from Sen. Hollis French, the chairman of the state Senate Judiciary Committee, which on Friday issued subpoenas to Palin's husband, Todd, and 10 members of her administration.

In addition, Palin spokeswoman Meg Stapleton said another lawsuit had been filed by citizens in Fairbanks, Alaska, complaining the Legislature was "wasting public monies by continuing its politicized investigation." And Stapleton said House Speaker John Harris urged French and Elton to "reconsider" the probe, which was authorized with bipartisan support that she said no longer exists.

Palin, the Republican nominee for vice president, is battling allegations she and her advisers pressured then-Public Safety Commissioner Walt Monegan to fire a state trooper going through a bitter custody dispute with Palin's sister -- and that Monegan was terminated when he refused. Palin says she fired Monegan over budget issues, and denies any wrongdoing.

Also named as a defendant in the Republicans' lawsuit is Stephen Branchflower, the former Anchorage prosecutor hired to investigate Monegan's firing.

The lawsuit alleges that Elton, French and Branchflower "are conducting a McCarthyistic investigation in an unlawful, biased, partial and partisan political manner in order to impact the upcoming Alaska general and national presidential elections." Watch how state probe is turning political »

Palin originally pledged to cooperate with the investigation that the Alaska Legislative Council commissioned in July. But since becoming Sen. John McCain's running mate, campaign spokesmen have lashed out at the probe as "tainted" and "partisan," and fought to get the state Personnel Board to launch its own probe.

"I think it's fair to say that the governor is not going to cooperate with that investigation so long as it remained tainted and run by partisan individuals who have a predetermined conclusion," McCain-Palin campaign spokesman Ed O'Callaghan said Monday.

In particular, campaign officials singled out comments French made to ABC News that they said suggested the investigation could yield criminal charges or an "October Surprise" for the GOP ticket. And they accuse the probe of being "hijacked" by Democratic presidential candidate Barack Obama's campaign -- a charge the Obama campaign dismissed as "complete paranoia."

Monegan said he was repeatedly pressured to take action against State Trooper Mike Wooten, Palin's ex-brother-in-law, before his July dismissal.

Monday, the McCain-Palin campaign released documents it said bolster its argument that Monegan was fired over budget disputes and "egregious insubordination."

All About Sarah Palin • Alaska