President Donald Trump advanced a theory Thursday that a surveillance warrant was obtained against him using information gleaned from the salacious dossier compiled by opposition research firm Fusion GPS.

“House votes on controversial FISA ACT today.” This is the act that may have been used, with the help of the discredited and phony Dossier, to so badly surveil and abuse the Trump Campaign by the previous administration and others? — Donald J. Trump (@realDonaldTrump) January 11, 2018

Disproven and paid for by Democrats “Dossier used to spy on Trump Campaign. Did FBI use Intel tool to influence the Election?” @foxandfriends Did Dems or Clinton also pay Russians? Where are hidden and smashed DNC servers? Where are Crooked Hillary Emails? What a mess! — Donald J. Trump (@realDonaldTrump) January 11, 2018

The dossier, compiled by former British spy Christopher Steele, alleges collusion between the Russian government and Trump’s 2016 campaign and includes uncorroborated details about the president’s private life.

Trump’s critics have held up the dossier as proof of impropriety during the election while others point to a serious lack of evidence supporting the most salacious claims as grounds for dismissing the dossier entirely.

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The dossier was reviewed by the FBI before during the 2016 campaign and may have been used to obtain a surveillance warrant on members of the Trump campaign.

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