President Trump Donald John TrumpUS reimposes UN sanctions on Iran amid increasing tensions Jeff Flake: Republicans 'should hold the same position' on SCOTUS vacancy as 2016 Trump supporters chant 'Fill that seat' at North Carolina rally MORE on Tuesday lashed out at Fox News for having Democrats on air, predicting it would mark "the beginning of the end" for the network.

The president bemoaned that Fox was "trying to be so politically correct" by having Democrats on air following an appearance on "America's Newsroom" from Sen. Chris Van Hollen Christopher (Chris) Van HollenMid-Atlantic states sue EPA over Chesapeake Bay pollution Trump payroll-tax deferral for federal workers sparks backlash Senators urge administration to make payroll tax deferral optional for federal workers MORE (D-Md.).

"So, what the hell has happened to @FoxNews. Only I know!" Trump tweeted, turning his scorn to two news anchors who have challenged favorable commentary on the president.

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"Chris Wallace Christopher (Chris) WallaceThe Memo: Media accused of using kid-gloves on Biden Biden town hall draws 3.3 million viewers for CNN Gates says travel ban made COVID-19 worse in US MORE and others should be on Fake News CNN or MSDNC," he continued. "How’s Shep Smith doing? Watch, this will be the beginning of the end for Fox, just like the other two which are dying in the ratings. Social Media is great!"

Really pathetic how @FoxNews is trying to be so politically correct by loading the airwaves with Democrats like Chris Van Hollen, the no name Senator from Maryland. He has been on forever playing up the Impeachment Hoax. Dems wouldn’t even give Fox their low ratings debates.... — Donald J. Trump (@realDonaldTrump) January 28, 2020

The president's complaint about Van Hollen's appearance comes as his impeachment trial is set to enter its seventh day in the Senate. Democratic senators have pushed for additional witnesses, including former national security adviser John Bolton John BoltonDiplomacy with China is good for America The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Pence lauds Harris as 'experienced debater'; Trump, Biden diverge over debate prep DOJ launches probe into Bolton book for possible classified information disclosures MORE, to testify.

Trump has frequently belittled Fox News when news anchors deliver unfavorable analysis or when Democrats are featured prominently on air. He has in the past targeted Smith, who left the network last year, Wallace and former Democratic National Committee (DNC) leader Donna Brazille, who is a contributor for the network.

Yet Fox News remains his preferred network in many ways. He sat for an interviews earlier this month with Laura Ingraham Laura Anne IngrahamEx-Pence aide: Trump spent 45 minutes of task force meeting 'going off on Tucker Carlson' instead of talking coronavirus Sean Hannity and Lou Dobbs to be deposed in Seth Rich lawsuit: report NYC living statue shows Trump desecrating graves of war dead, COVID-19 victims MORE and Fox Business Network host Maria Bartiromo Maria Sara BartiromoBiden's team says he views election against Trump as 'Park Avenue vs. Scranton' Ex-NFL player running for House as Republican blasts Democrats as 'narcissists and sociopaths' Cruz says he wouldn't accept Supreme Court nomination MORE and spoke with the network last week at the March for Life. He regularly tweets out quotes from Fox News guests and cites commentary from opinion hosts like Sean Hannity Sean Patrick HannitySunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Cruz: Trump should nominate a Supreme Court justice next week Ex-Pence aide: Trump spent 45 minutes of task force meeting 'going off on Tucker Carlson' instead of talking coronavirus MORE and Lou Dobbs Louis (Lou) Carl DobbsSean Hannity and Lou Dobbs to be deposed in Seth Rich lawsuit: report Trump praises several Fox News shows at briefing for coverage of Russia probe GOP leader says he doesn't want Chamber's endorsement: 'They have sold out' MORE.

Mark Knoller, a CBS News White House correspondent who tracks data about the presidency, noted Trump has given 70 interviews to Fox since taking office, compared to five for the next closest major network.