Walker, appearing at the opening day of the State Fair, offered his advice to Trump after the GOP presidential nominee declined to endorse House Speaker Paul Ryan this week and praised the Janesville Republican's primary opponent. That move has drawn criticism from many GOP elected officials in Wisconsin, and Walker, Ryan and U.S. Sen. Ron Johnson, R-Oshkosh, are not attending Trump's Friday rally in Green Bay, citing other commitments.  

"My advice to him is spend your time talking about the difference between her and him and ultimately what he's going to do to make everyday Americans' lives better," Walker told reporters.

Walker urged Trump, who is campaigning in Green Bay with vice presidential nominee Mike Pence, to talk to Wisconsinites who "feel left out of whatever slow recovery is happening in this nation."

"If he can talk to them, and say that he's got their back, that he can actually do something to make their lives better, then I believe, in the end he can win," Walker said.

"Any day he's not talking about that or about Hillary Clinton is a lost opportunity, because I think people are hungry for a change, they don't like the way this country is headed right now, they want to do better and they're uncomfortable with Hillary Clinton.'

Walker dismissed speculation Trump could drop out of the race, and repeatedly knocked Clinton over the FBI investigation into her email practices, calling her "unfit" to serve as president.

-- By David Wise