Wisconsin Gov. Scott Walker walks off the stage after speaking at the Freedom Summit in Des Moines, Iowa, in January. (REUTERS/Jim Young)

Wisconsin Gov. Scott Walker plans to travel to Michigan to speak at two Republican fundraisers on Monday, continuing his tour of the Midwest ahead of a likely run for president.

He won't be the only prominent Republican in the state that day: Ben Carson, a retired neurosurgeon, plans to be in his hometown of Detroit on Monday to formally announce that he will run for president. U.S. Sen. Rand Paul of Kentucky, who is already in the race, plans to be in Grand Rapids for a "Stand with Rand" event hosted by U.S. Rep. Justin Amash (R-Mich.).

And more visits are planned for later in the month: Former Florida governor Jeb Bush, another likely candidate, will headline a May 28 GOP fundraiser in Bath. Carly Fiorina, a former corporate chief executive who is expected to announce her candidacy on Monday, will headline a Michigan Chamber of Commerce fundraiser on May 12 in Lansing.

Meanwhile, there's speculation that Michigan Gov. Rick Snyder (R) could also get into the race. Michigan's primary is later than the much-watched early states that candidates heavily visit -- namely Iowa, New Hampshire and South Carolina. But there's another attraction: the state is home to many wealthy donors.

On Monday, Walker is expected to deliver remarks at a luncheon in Lansing hosted by the Ingham County GOP. In the evening, Walker will give the keynote address at a Lincoln Day dinner hosted by the Oakland County GOP in Novi, a suburb of Detroit. It's his first formal visit to the state since forming a committee, Our American Revival, earlier this year to fund his travels.