Trump accuses DOJ, Mueller's office of 'leaking' his attorneys' letters

President TrumpDonald John TrumpRussian sanctions will boomerang States, cities rethink tax incentives after Amazon HQ2 backlash A Presidents Day perspective on the nature of a free press 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 MuellerRobert (Bob) Swan 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.

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 ComeyJames Brien ComeyA tale of two lies: Stone, McCabe and the danger of a double standard for justice DOJ attorney looking into whether CIA withheld info during start of Russia probe: NYT Graham requests interviews with DOJ, FBI officials as part of probe into Russia investigation 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 ManafortPaul John ManafortA tale of two lies: Stone, McCabe and the danger of a double standard for justice Fox's Napolitano: Roger Stone 'absolutely entitled' to new trial after juror's tweets revealed Jessie Liu resigns after nomination for Treasury post withdrawn: report MORE, who awaits trial on tax fraud and money laundering charges.