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 Friday insisted he did not know about the June 2016 Trump Tower meeting where Russians promised to offer damaging information on Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonFox News poll: Biden ahead of Trump in Nevada, Pennsylvania and Ohio Trump, Biden court Black business owners in final election sprint The power of incumbency: How Trump is using the Oval Office to win reelection MORE, denying a CNN report that his former personal attorney Michael Cohen says he did.

"And so the Fake News doesn’t waste my time with dumb questions, NO, I did NOT know of the meeting with my son, Don jr," Trump wrote in a series of early morning tweets.

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Trump accused Cohen of making up the claim to get himself out of legal trouble from a federal investigation into his business practices, including his ownership of taxi medallions in New York City.

"Sounds to me like someone is trying to make up stories in order to get himself out of an unrelated jam (Taxi cabs maybe?)," the president added, without referring to Cohen by name.

....,the only Collusion with Russia was with the Democrats, so now they are looking at my Tweets (along with 53 million other people) - the rigged Witch Hunt continues! How stupid and unfair to our Country....And so the Fake News doesn’t waste my time with dumb questions, NO,.... — Donald J. Trump (@realDonaldTrump) July 27, 2018

.....I did NOT know of the meeting with my son, Don jr. Sounds to me like someone is trying to make up stories in order to get himself out of an unrelated jam (Taxi cabs maybe?). He even retained Bill and Crooked Hillary’s lawyer. Gee, I wonder if they helped him make the choice! — Donald J. Trump (@realDonaldTrump) July 27, 2018

CNN reported Thursday that Cohen claims Trump had prior knowledge of the meeting between his son and a Kremlin-connected lawyer and is willing tell his account to 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, who is investigating alleged ties between the Trump campaign and Moscow's election interference efforts in 2016.

The back-and-forth marks a further escalation of the feud between Trump and Cohen, which poses legal and political problems for the president and for the White House.

Despite those risks, Trump and Cohen have continued to wage their legal battle in the court of public opinion.

The president on Friday morning also blasted Cohen's decision to hire former Bill Clinton William (Bill) Jefferson ClintonAnxious Democrats amp up pressure for vote on COVID-19 aid Barr's Russia investigator has put some focus on Clinton Foundation: report Epstein podcast host says he affiliated with elites from 'both sides of the aisle' MORE hand Lanny Davis as his attorney representing him in the matter. (Davis is a columnist for The Hill.)

"He even retained Bill and Crooked Hillary’s lawyer. Gee, I wonder if they helped him make the choice!" Trump wrote.

Trump also attacked Mueller's team in response to reports it is examining his tweets in order to determine whether he obstructed justice in the Russia investigation.

"The only Collusion with Russia was with the Democrats, so now they are looking at my Tweets (along with 53 million other people) — the rigged Witch Hunt continues! How stupid and unfair to our Country," Trump wrote.

Arrived back in Washington last night from a very emotional reopening of a major U.S. Steel plant in Granite City, Illinois, only to be greeted with the ridiculous news that the highly conflicted Robert Mueller and his gang of 13 Angry Democrats obviously cannot find Collusion... — Donald J. Trump (@realDonaldTrump) July 27, 2018

The New York Times reported Thursday that Mueller is reviewing Trump’s tweets about 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 and fired FBI Director James Comey James Brien ComeySteele Dossier sub-source was subject of FBI counterintelligence probe Judge will not dismiss McCabe's case against DOJ Democrats fear Russia interference could spoil bid to retake Senate MORE as possible evidence of witness tampering.

Trump has repeatedly attacked the Mueller probe as a "witch hunt," even though it has secured indictments or guilty pleas from 32 individuals, including four former Trump associates.