Lawyers with the Justice Department's Office of the Inspector General who are looking into the origins of an FBI investigation that was taken over by former 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 reportedly interviewed the author of a dossier that alleged impropriety between 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's campaign and Russia.

Three attorneys with the inspector general's office met with Christopher Steele in June during Trump's state visit to the United Kingdom, two unidentified sources told Reuters.

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One source told the news service that the investigation has apparently been extended on the basis of Steele's information.

The Hill has reached out to the Justice Department for comment.

Steele, a former British spy, alleged potential collusion between the Trump campaign and Russia and that Moscow was trying to interfere with U.S. elections.

Steele compiled the dossier for Fusion GPS, a Washington political research firm hired by Democratic 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’s presidential campaign. He later shared the information he discovered with the British government.

He has emerged as a top GOP target, with congressional Republicans and Trump repeatedly slamming him for starting an investigation they believe was improper.