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Mark Cuban says his relationship with the Dallas Mavericks’ new ownership has deteriorated, alleging that Patrick Dumont failed to honor a “handshake agreement” that would have allowed him to continue overseeing the team’s basketball operations after selling his majority stake.

“I don’t regret selling. I regret who I sold to,” Cuban said at the end of March. “I made a lot of mistakes in the process, and I’ll leave it at that.”

The Adelson and Dumont families have already confirmed they plan to exercise their contractual right to purchase an additional 20 percent ownership stake from Cuban.

Former Mavericks minority owner and team president Frank Zaccanelli dismissed Cuban’s legal argument, saying a verbal agreement carries little weight in a multibillion-dollar franchise sale.

“The bottom line is this: Mark sold majority ownership and control in the team,” Zaccanelli told The Dallas Morning News on Wednesday.

“He did it willfully. He did it with full knowledge. Trying to point to some handshake deal in a $3.8 billion sale of an NBA franchise is maybe the weakest legal position I’ve ever heard of in 50 years of business.”

Mark Cuban's battle with the new Mavs ownership group continues, plus more news and notes out of Dallas: https://t.co/kFMMny9XSs