Former Wisconsin Gov. Tommy Thompson says he's not ruling out another run for the state's highest office."Everything is on the table," he told WISN 12 Tuesday morning. "I'm not saying it's in the cards. But, I'm physically and mentally capable of doing anything."The Republican, 80, said he's going to sit down with his family in April and discuss the future. He is Interim President of the University of Wisconsin System but submitted his letter of resignation last week.It's effective March 18.Thompson took over as head of the UW System in July 2020 after the Board of Regents failed to find a replacement when Ray Cross retired. When asked about butting heads with Republicans in the Wisconsin legislature on COVID-19 policies for the UW System, Thompson said it's not the reason he's resigning."The legislature and I are getting along just fine. And, I'm happy to say that. In fact over the next couple of months we're going to get some very good legislation done," Thompson said. "We had a little run-in a couple of times. But, overall I stood my ground. And we were able to succeed."Thompson said his priorities are reciprocity with other universities, allowing the UW System to invest its own money, building a new engineering building and growing the number of teachers and nurses in the state.He was first elected Governor of Wisconsin in 1986 and won reelection three times.Thompson left office in 2001 to serve as President George W. Bush's Health and Human Services Secretary.He served in that role until early 2005.Thompson had a 7-month campaign for president in 2007 before dropping out and endorsing former New York City Mayor Rudy Giuliani.He ran for U.S. Senate in 2012 but lost to Democrat Tammy Baldwin.Thompson's gubernatorial candidacy would force a primary election against Former Wisconsin Lt. Gov. Rebecca Kleefisch.Republican Kevin Nicholson has also said he was considering a run for the state's highest office.