Gov. Scott Walker Calls Possibility of Taking Online Courses to Finish Degree in WH 'Interesting'

Last president without a college degree was Harry Truman.

"I've got two sons who very, very well, before the next election, at least one of them, may have his degree and the other would be just a year out," Walker told ABC News' Jon Karl.

"Part of it was I wanted to make sure they went through and got what they needed," he said.

Walker -- in Iowa to attend GOP Iowa Sen. Jon Ernst's "Roast and Ride" event -- left Marquette University without a degree more than two decades ago. According to Fusion, President Harry Truman was the last U.S. president who did not have a college degree.

During the interview, Walker acknowledged the difficulty of finishing his degree while considering a presidential bid.