Alaska governor Sarah Palin has testified for two hours in an abuse-of-power investigation that has been a distraction to her Republican vice presidential campaign.

John McCain's running mate Sarah Palin unlawfully abused her power as Alaska's governor by trying to have her former brother-in-law fired as a state trooper, US officials said.

The husband of Alaska governor and John McCain’s running mate Sarah Palin has refused to give evidence in the “Troopergate” investigation of his wife’s alleged abuse of power.