WATCH: Mark Cuban Joins Kamala Harris At Wisconsin Rally Amid Calls For Him to Buy Twitter

Successful billionaire businessman Mark Cuban has already endorsed Vice President Kamala Harris, sitting for several interviews with more right-wing podcast hosts to spread the word that Donald Trump is unfit to lead.

Now, Cuban is taking his act on the road to campaign with the Vice President at a series of appearances starting in the key battleground state of Wisconsin on Thursday with stops in Milwaukee and La Crosse.

Cuban has been openly critical of both Trump and Elon Musk, particularly now that it's been revealed Musk had been funding Trump's campaign via a PAC for years before acquiring Twitter. 

The "Shark Tank" star has increased his presence in the political arena, which has garnered him criticism from MAGA and praise from liberals, to the point that there's an active campaign to get him to buy Twitter from Musk, who's facing legal consequences for interfering in the American election process.

Cuban held a call with reporters in September on behalf of the Harris/Walz campaign where he talked about how he held regular conversations with aides and, at the end of the process, "I get back a serious well-studied response; that's the antithesis of what Donald Trump is doing."

"He doesn't think these things through," he added of Trump, calling some of his ideas "often ridiculous if not insane."

Cuban, who still retains a minority share in the Dallas Mavericks, will headline a town hall in Phoenix on Saturday. He'll also make a Sunday stop in Grand Rapids, Michigan, along with Second Gentleman Douglas Emhoff.