President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE on Thursday lashed out at MSNBC and CNN, saying the networks invite guests to appear “as experts on ‘Trump’” that “have no idea what I am all about.”

“Just watched a world class loser, Tim O’Brien, who I haven’t seen or spoken to in many years, & knows NOTHING about me except that he wrote a failed hit piece book about me 15 years ago,” Trump said in the first of a pair of early morning tweets. “Fired like a dog from other jobs? Saw him on Lyin’ Brian Williams Trump Slam Show. Bad TV.”

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“I am so amazed that MSNBC & CNN can keep putting on, over and over again, people that have no idea what I am all about, and yet they speak as experts on ‘Trump,’” the president continued.

“Same people since long before the 2016 Election, and how did that work out for the Haters and Losers. Not well!” he added.

....I am so amazed that MSNBC & CNN can keep putting on, over and over again, people that have no idea what I am all about, and yet they speak as experts on “Trump.” Same people since long before the 2016 Election, and how did that work out for the Haters and Losers. Not well! — Donald J. Trump (@realDonaldTrump) August 8, 2019

O'Brien is the executive editor of Bloomberg Opinion and wrote a biography about Trump in 2005, before he was president.

The president has often targeted the two networks and their employees over their coverage of his administration.

The president's comments come a day after he lashed out at cable news coverage of a speech made by former Vice President Joe Biden Joe BidenPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Hillicon Valley: Subpoenas for Facebook, Google and Twitter on the cards | Wray rebuffs mail-in voting conspiracies | Reps. raise mass surveillance concerns Fox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio MORE, in which the 2020 Democratic front-runner took aim at the president's rhetoric and lack of “moral leadership.”

"Trump offers no moral leadership, seems to have no interest in unifying this nation. No evidence that the presidency has awakened his conscience in the least," Biden said in Burlington, Iowa. "Indeed, we have a president with a toxic tongue who has publicly and unapologetically embraced a political strategy of hate, racism and division."

Biden's comments came as Trump was visiting Dayton, Ohio, and El Paso, Texas, to meet with first responders and survivors from a pair of mass shootings that shook the nation last weekend.

Trump called the media coverage of Biden's speech “boring” while tweeting aboard Air Force One that the “LameStream Media will die in the ratings and clicks with this guy.”

“It will be over for them, not to mention the fact that our Country will do poorly with him. It will be one big crash, but at least China will be happy!" he added.