Despite the Trump campaign's grievances, Fox News' polls are among the most reputable in the industry. Conducted since 2010 by two campaign veterans — Boston-based Democrat Chris Anderson, who polls for Massachusetts state Attorney General Maura Healey, and Republican Daron Shaw, a professor of the University of Texas in Austin and a longtime adviser to former Gov. Rick Perry — the poll has a long track record of accuracy.

At Fox News, the poll is managed by Dana Blanton, the network's vice president for public opinion research, along with politics editor Chris Stirewalt and Arnon Mishkin, who has led the network's election-night decision desk for decades. The trio was profiled last month by the Los Angeles Times under the headline, "Inside Fox News’ polling 'nerdquarium,' whose numbers don't lie whether Trump likes them or not."

And while the poll sample did consist of more Democrats (48 percent, including self-identified independents who said they lean toward the Democratic Party) than Republicans (40 percent, including GOP-leaning independents), that is consistent with their past surveys and mountains of other research that show that more Americans identify as Democrats than Republicans.

Trump has long waged war on the news media, but in recent months he has also lobbed complaints at his long-preferred network. Earlier this summer, the president teed off on Fox, urging his supporters to find a new network.

“With people like Andrew Napolitano, who wanted to be a Supreme Court Justice & I turned him down (he’s been terrible ever since), Shep Smith, @donnabrazile (who gave Crooked Hillary the debate questions & got fired from @CNN), & others,” he said on Thursday.

The president has also grown increasingly agitated with Fox News for devoting time to town halls with 2020 Democratic presidential candidates, including with Sen. Bernie Sanders and South Bend Mayor Pete Buttigieg.

“@FoxNews doesn’t deliver for US anymore,” Trump concluded on Thursday. “It is so different than it used to be. Oh well, I’m President!”

As his Twitter blast continued, Trump commended on One America News, a right-wing pay television news channel, on “fair coverage and brilliant reporting.”

“It is appreciated by many people trying so hard to find a new, consistent and powerful VOICE!”

Steven Shepard contributed to this report.