"Wouldn't you want somebody talking to you about politics, only if he had actually worked in politics?" Epshteyn said.
On Twitter, President Trump called Sinclair "far superior" to other media companies and mocked those who "criticize Sinclair for being biased."
His comments raise questions about White House impartiality, as the Justice Department and the FCC review Sinclair's attempted acquisition of Tribune Media.
"This merger's gonna go through," SAID Andrew Schwartzman, a professor at Georgetown University Law Center. "We're going to wind up with a handful of large companies owning much of the broadcasting industry with much less diversity and much less localism."
This issue is similar to AT&T's efforts to acquire Time Warner. The president has often bashed Time Warner's property CNN and his own Justice Department wants to block that deal, but the judge overseeing the merger hasn't allowed the president's influence to be examined in the trial.