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 has reportedly been privately venting about the trial of his former campaign head Paul Manafort Paul John ManafortOur Constitution is under attack by Attorney General William Barr Bannon trial date set in alleged border wall scam Conspicuous by their absence from the Republican Convention MORE, believing that it is an attempt by special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE to embarrass him.

The Washington Post reported Saturday that Trump thinks both the media and Mueller are using this week's trial on Manafort's bank and tax fraud charges to try to undercut his presidency.

“He is completely outraged by the way Manafort has been treated, with the solitary confinement and all of that,” Trump’s attorney Rudy Giuliani told the Post. “It’s obvious to him that they’re all but torturing Manafort in order to try to get him to flip.”

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The trial is the first in Mueller’s probe into Russia's election interference, which the president has long claimed is rigged against him and is a “witch hunt.” Manafort has pleaded not guilty to the charges.

The Post reported that Trump has approved of Judge T.S. Ellis, who is presiding over the trial: Ellis chided federal prosecutors for presenting too much evidence on Manafort’s spending, and told attorneys on both sides to "rein in their facial expressions."

Trump lashed out over Mueller's probe in several tweets over the past week, escalating his attacks by calling on Attorney General Jeff Sessions Jefferson (Jeff) Beauregard SessionsRoy Moore sues Alabama over COVID-19 restrictions GOP set to release controversial Biden report Trump's policies on refugees are as simple as ABCs MORE to stop the investigation.

Trump's attorneys and White House press secretary Sarah Huckabee Sanders later said the president was expressing his opinion and not giving an order.

The president has recently tweeted about Manafort, asking if mob boss Al Capone or Manafort "was treated worse."

Trump also repeated his assertion that Manafort "worked for me for a very short time" and questioned why federal investigators didn't "tell me that he was under investigation."

Paul Manafort worked for Ronald Reagan, Bob Dole and many other highly prominent and respected political leaders. He worked for me for a very short time. Why didn’t government tell me that he was under investigation. These old charges have nothing to do with Collusion - a Hoax! — Donald J. Trump (@realDonaldTrump) August 1, 2018