Senator John McCain's VP Pick: "Hold me accountable."

In naming her as his vice presidential running mate Friday, Sen. John McCain hailed Alaska Gov. Sarah Palin as “someone who has fought against corruption.” But Palin is under two ethics investigations springing from accusations that she abused her office to pursue a personal grudge.

Palin has said she welcomes the investigations: “Hold me accountable.”

The investigations are reviewing the same accusation: that she dismissed the state’s top law enforcement official because of his refusal to fire a state trooper in a dispute that predated her election in 2006.

When she dismissed Alaska Public Safety Commissioner Walt Monegan on July 11, Palin said she wanted to take the commission in a new direction.

A week later, Monegan told NBC affiliate KTUU of Anchorage that he thought it was likely that he had been dismissed because he resisted pressure from Palin’s staff and husband to fire the trooper, who was involved in a bitter custody battle with the governor’s sister after their divorce in 2005.

Last month, the state Legislature appointed an independent investigator to review whether the governor or her aides abused their power by pressuring Monegan to fire the trooper, a probe that the Democratic chairman of the state Senate Judiciary Committee said could lead to Palin’s impeachment. The outside investigator, a retired assistant district attorney in Anchorage, was directed to file his report by Oct. 31, four days before the presidential election.

Palin strongly denied the accusations and ordered her own investigation by the state Law Department.

In a July 31 interview with CNBC, Palin defended the dismissal of Monegan, saying, “It is a governor’s prerogative, a right, to fill that Cabinet with members whom she or he believes will do best for the people whom we are serving.”