JUNEAU, (Alaska) - REPUBLICAN vice-presidential pick Sarah Palin has hired a private lawyer to represent her in an investigation that she abused her powers as Alaska governor, her office confirmed on Monday.

Mrs Palin is being investigated by Alaska's legislature over allegations arising from the sacking of the state's public safety commissioner, Mr Walt Monegan, who was fired earlier this year.

The probe was triggered after Internet reports that Mr Monegan was removed because he refused to fire a state trooper who was the governor's ex-brother-in-law, that the Palin family regarded as a 'loose cannon'.

Palin's deputy press secretary Sharon Leighow confirmed Mrs Palin had hired Anchorage attorney Thomas Van Flein to represent her and other members of the governor's office involved in the probe.

'I can confirm that she hired the attorney,' Ms Leighow told sources, without providing further details.

AFP has also obtained a copy of a letter sent by Palin's lawyers to Steve Branchflower, the special counsel hired by the Alaska legislature to investigate the case.

In a letter dated August 29, Mr Van Flein requested that the probe be handled by the state's personnel board as well as witness statements, documents and all other material relevant to the case.

However Alaska senator Hollis French, who is overseeing the leglislative investigation, rejected both requests in a letter released to media on Monday.

'Governor Palin has repeatedly stated that she has nothing to hide and that she and her administration will cooperate fully with this investigation. Is your client aware that you seem to be challenging the legislature's jurisdiction,' Ms French wrote.

Ms French also refused to hand over materials requested by Palin's lawyer.

'It would be highly unusual for an investigator to share information with one of the targets of the investigation,' Ms French wrote.

'I am unaware of any precedent for such an arrangement.' Ms French added that he expected Mrs Palin and other officials to give fixed dates for depositions later this month by September 5.

The investigation - dubbed 'Troopergate' - followed Mr Monegan's dismissal in July.

Mrs Palin has consistently denied that she put pressure on Mr Monegan to fire the trooper involved, describing the allegations as 'outrageous' and 'false'.

However it emerged on August 13 that there had been more than 20 calls, emails and other communications from Mrs Palin's office to employees at Mr Monegan's Department of Public Safety. -- AFP