President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Saturday continued his attacks on the special counsel investigation into possible Russian links to his campaign, questioning in a tweet whether officials from 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's office or the Justice Department had released letters from Trump's attorneys to the media.

In the tweet Saturday afternoon, the president questioned whether the "witch hunt" investigation against him would "ever end," and demanded investigators look at corruption among Democratic politicians instead.

"There was No Collusion with Russia (except by the Democrats). When will this very expensive Witch Hunt Hoax ever end? So bad for our Country. Is the Special Counsel/Justice Department leaking my lawyers letters to the Fake News Media? Should be looking at Dems corruption instead?" he wrote.

There was No Collusion with Russia (except by the Democrats). When will this very expensive Witch Hunt Hoax ever end? So bad for our Country. Is the Special Counsel/Justice Department leaking my lawyers letters to the Fake News Media? Should be looking at Dems corruption instead? — Donald J. Trump (@realDonaldTrump) June 2, 2018

The tweet apparently referred to a New York Times story, published minutes later, that revealed the contents of a confidential 20-page letter Trump's attorneys reportedly sent to Mueller's team earlier this year.

The unprecedented letter contends that Trump could not possibly be charged with obstruction of justice for firing former FBI Director James Comey James Brien ComeyDemocrats fear Russia interference could spoil bid to retake Senate Book: FBI sex crimes investigator helped trigger October 2016 public probe of Clinton emails Trump jabs at FBI director over testimony on Russia, antifa MORE last year, as the Constitution grants the president absolute authority over federal investigations.

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The Constitution allows the president, “if he wished, [to] terminate the inquiry, or even exercise his power to pardon," the letter reads.

It was unclear what exactly prompted Trump's accusation, though Trump's attorneys have reportedly been in contact with Mueller's team. In May, CNN reported that Trump's lawyers were in negotiations with Mueller's team to seek to limit the scope of the special counsel's possible interview with the president.

Trump has frequently characterized the Mueller investigation as an unfair "witch hunt." No charges have yet been brought related to allegations of Trump campaign collusion with Russia during the election.

Several former Trump aides have been charged so far in the investigation, including former national security adviser Michael Flynn, who pleaded guilty last year to lying to FBI agents, and former campaign chairman 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, who awaits trial on tax fraud and money laundering charges.