Co-founder of firm behind dossier tying Trump to Russia testifying next week

The co-founder of the firm who ordered a salacious dossier on President Trump will testify before the Senate Judiciary Committee next week.

Glenn Simpson’s opposition research firm, Fusion GPS, hired former British spy Christopher Steele to investigate then-candidate Trump.

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The dossier produced by Steele claims Trump and the Kremlin had worked together to undermine Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonMeghan McCain: 'SNL' parodies made me feel like 'laughing stock of the country' Hill: Trump reelection would spur 'one constitutional crisis after another' Trump defends indicted GOP congressman MORE’s campaign.

The unsubstantiated findings in the dossier were released to media outlets and published by BuzzFeed in January.

Simpson will testify before the committee on Wednesday. 

Senate Judiciary Chairman Chuck GrassleyChuck GrassleyAnother voice of reason retires Overnight Health Care — Presented by Carequest — FDA moves to sell hearing aids over-the-counter McConnell: GOP should focus on future, not 'rehash' 2020 MORE (R-Iowa) demanded details on the dossier in a letter last May, and threatened to subpoena Fusion GPS in June.