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.

The dossier produced by Steele claims Trump and the Kremlin had worked together to undermine Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonBiden slams Trump over golf gif hitting Clinton Overnight Cybersecurity: Equifax hit by earlier hack | What to know about Kaspersky controversy | Officials review EU-US privacy pact Overnight Tech: Equifax hit by earlier undisclosed hack | Facebook takes heat over Russian ads | Alt-right Twitter rival may lose domain 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 GrassleyCharles (Chuck) Ernest GrassleyGrassley: 'Good chance' Senate panel will consider bills to protect Mueller Overnight Finance: CBO to release limited analysis of ObamaCare repeal bill | DOJ investigates Equifax stock sales | House weighs tougher rules for banks dealing with North Korea GOP state lawmakers meet to plan possible constitutional convention MORE (R-Iowa) demanded details on the dossier in a letter last May, and threatened to subpoena Fusion GPS in June.