He also told the Anchorage Daily News that Palin wasn't in any criminal legal jeopardy.
"I can say definitively I am aware of no criminal investigation whatsoever involving Sarah Palin. Zero," he said.
The FBI reiterated that claim Saturday, telling the Los Angeles Times for a story Sunday that the Federal Bureau of Investigation was not investigating Palin's activities as governor, a former mayor or in any other capacity.
"There is absolutely no truth to those rumors that we're investigating her or getting ready to indict her," Special Agent Eric Gonzalez, the bureau's Alaska spokesman, said.
Palin has kept a low profile since her sudden announcement Friday at a hastily called news conference at her home in suburban Wasilla, outside Anchorage. All of her public communication since then has been on the social networking sites Facebook and Twitter, or through statements released by her office.
At the same time, Palin informed her spokesman David Murrow early Saturday that someone using the name "exgovsarahpalin" on Twitter was spreading a false rumor that there was to be a party at her suburban home in Wasilla, outside Anchorage. Palin was afraid her home would be mobbed, and security was dispatched, Murrow said.
With only a few weeks before she steps down on July 26, and Alaska Lt. Gov. Sean Parnell takes her place, the governor spent the Fourth of July weekend in the state capital, Juneau, but was only spotted briefly on the sidelines of the city's parade.
She had been invited to ride in a convertible, as she did last year, but never told organizers whether she would attend.