Mark Cuban appeared at a July campaign rally with Hillary Clinton in Pittsburgh, his hometown. (Justin Sullivan/Getty Images)

Unlike San Antonio Spurs Coach Gregg Popovich, who made his displeasure with the first day of the Trump administration known Saturday, Dallas Mavericks owner Mark Cuban is taking a measured approach to the new president.

Cuban shares a reality-show background with President Trump and wasn’t shy about criticizing him as the “Shark Tank” star campaigned for Hillary Clinton during the campaign. Now, though, Cuban is waiting and watching the man who has been in office a little more than 48 hours.

“He’s our president, and this is my country,” Cuban said Saturday (via the Dallas Morning News). “It’s a peaceful transition of power. I know people expect me to give him a lot of [grief]. But rather than shadow-boxing about what he might do, I’d rather deal with what he does. And there are some positive things and some negative things, just like with any president.”

Cuban added: “It’s like talking about the Mavs. Sometimes you speak to your fan base. And sometimes you tell the truth.” As for telling the truth, he noted that he does it “whenever I need to. Take what I say seriously but not literally.”

The idea of “alternative facts” broached by Kellyanne Conway on “Meet the Press” after press secretary Sean Spicer’s disputed crowd size estimates later Saturday hasn’t changed Cuban’s mind. “In time,” he wrote The Post in an email Sunday afternoon, “we will know whether to take [Trump] literally, seriously, both or neither.”

Although he endorsed Clinton, Cuban has called himself an independent. He called Trump “bat—- crazy” during a campaign stop last summer in his hometown of Pittsburgh.

“Trump scares me,” Cuban said. “Donald, initially, I really hoped he would be something different, that as a businessperson, I thought there was an opportunity there. But then he went off the reservation and went bats—- crazy.”