Media mogul Charlie Ergen is fighting back against allegations that his Dish can’t be trusted to replace Sprint as the nation’s fourth-largest wireless carrier.

“People are pretty sneaky and talk to reporters and analysts, but it is not true,” he told a Manhattan federal judge on Tuesday. “It’s always part of a campaign to cast doubt on a new entrant.”

Ergen made the comments in response to a question by the judge overseeing the trial to block T-Mobile’s $26 billion merger with Sprint. The question seemed to address The Post’s Dec. 8 report that the coalition of attorneys general seeking to block the deal plans to argue that Ergen isn’t a suitable Sprint replacement by pointing to the hoard of spectrum he is currently sitting on, despite promises to the Federal Communications Commission to have made use of it by now. Dish is buying spectrum from T-Mobile, if it acquires Sprint.

“[The FCC] doesn’t think Dish is a bad company like some people might want to whisper,” Ergen told the judge.

The attorneys general will question the billionaire starting Wednesday.