Conservative operative and provocateur Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE is considering suing the federal government to determine if he was the subject of an FBI surveillance effort on the Trump campaign, his attorney wrote in letters to U.S. officials and lawmakers exclusively obtained by Hill.TV.

Stone's attorney leveled the threat in letters to U.S. Attorney John DurhamJohn DurhamTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Durham aide resigns from Russia probe amid concerns over pressure from Barr: report Trump praises several Fox News shows at briefing for coverage of Russia probe MORE, Senate Judiciary Chairman Lindsey Graham Lindsey Olin GrahamSenate GOP aims to confirm Trump court pick by Oct. 29: report The Hill's Campaign Report: GOP set to ask SCOTUS to limit mail-in voting Senate GOP sees early Supreme Court vote as political booster shot MORE (R-S.C.), and ranking House Intelligence Committee member Devin Nunes Devin Gerald NunesOvernight Defense: Stopgap spending measure awaits Senate vote | Trump nominates former Nunes aide for intelligence community watchdog | Trump extends ban on racial discrimination training to contractors, military Trump nominates former Nunes aide to serve as intel community inspector general Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election MORE (R-Calif.).

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"We have strong reason to believe that Mr. Stone was among three advisors to candidate Trump who was under surveillance by the FBI during the 2016 presidential campaign," Stone's attorney Paul Jensen wrote in the May 20 letter.

Jensen wrote in the letter he based the charges against the FBI on a New York Times front page story from January 20, 2017 titled "Wiretapped Data Used in Inquiry of Trump Aides." The story describes how the FBI was reviewing intercepted communications between associates of Trump and the Russian government. It specifically mentions Stone, former Trump 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, and former Trump advisor Carter Page as targets of the investigation.

"Having exhausted our administrative remedies we are now contemplating a tort lawsuit as a means to force the government to disclose the facts in this serious matter and to determine if Mr. Stone's 4th amendment rights were violated," Jensen's letter continues, also calling on Trump to fulfill a promise to declassify troves of FBI and DOJ documents relating to the investigation of his 2016 campaign.

Stone provided no evidence to substantiate his claim, though his inclusion of U.S. Attorney Durham is noteworthy. Durham was appointed by Attorney General William Barr Bill BarrHarris faces pivotal moment with Supreme Court battle Hillicon Valley: DOJ proposes tech liability shield reform to Congress | Treasury sanctions individuals, groups tied to Russian malign influence activities | House Republican introduces bill to set standards for self-driving cars McCarthy threatens motion to oust Pelosi if she moves forward with impeachment MORE to investigate possible FBI impropriety during the 2016 presidential campaign.

Stone is currently awaiting trial on seven counts brought 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's team including allegedly making false statements to Congress, tampering with a witness and obstructing a government investigation.