Senate panel subpoenas co-founder of firm tied to controversial Trump dossier
© Greg Nash

The Senate Judiciary Committee is subpoenaing the co-founder of the firm tied to a controversial opposition research dossier on President TrumpDonald John TrumpRepublicans consider skipping witnesses in Trump impeachment trial Bombshell Afghanistan report bolsters calls for end to 'forever wars' Lawmakers dismiss Chinese retaliatory threat to US tech MORE to testify before the committee next week. 

Sens. Chuck GrassleyCharles (Chuck) Ernest GrassleyLighthizer starts GOP charm offensive on Trump trade deal Bottom line Graham: FBI investigation in 2016 turned into a 'criminal conspiracy' MORE (R-Iowa) and Dianne FeinsteinDianne Emiel FeinsteinHillicon Valley: Apple, Facebook defend encryption during Senate grilling | Tech legal shield makes it into trade deal | Impeachment controversy over phone records heats up | TikTok chief cancels Capitol Hill meetings Apple, Facebook defend encryption during Senate grilling Houston police chief excoriates McConnell, Cornyn and Cruz on gun violence MORE (D-Calif.) said the move came after Glenn Simpson, the co-founder of Fusion GPS, declined to speak before the committee on Wednesday. 

"A subpoena has been issued to compel his attendance. Simpson’s attorney has asserted that his client will invoke his Fifth Amendment rights in response to the subpoena," the Senate leaders said in a statement. 

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Simpson had been listed as a witness for a public Judiciary Committee hearing scheduled for Wednesday regarding oversight of the Foreign Agents Registration Act and "attempts to influence U.S. elections."

But a spokesman for Grassley said earlier Friday that they had not heard from Simpson, who was not expected to agree to testify. 

Donald Trump Jr. and Paul Manafort, Trump's former campaign manager, were also listed as witnesses for the hearing. They have also not confirmed they will testify.

Grassley and Feinstein said Friday while they were not issuing subpoenas for the two, they "reserve the right to in the future."  

"Both Donald Trump Jr. and Paul Manafort ... have agreed to negotiate to provide the committee with documents and be interviewed by committee members and staff prior to a public hearing," Grassley and Feinstein said. 

Under committee rules, the committee can subpoena individuals by a vote of the full committee or when Grassley and Feinstein — as the committee's top two members — have an agreement.

Lawmakers have been clamoring to hear from Trump Jr. over his recently revealed meeting last year with a woman that represented herself as a Russian government lawyer offering damaging information on then-Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonTrump trade deal likely to sow division in Democratic presidential field Trump supporters at Pa. rally 'upset' after Democrats introduce impeachment articles Hillary Clinton documentary to premiere at Sundance MORE.

Manafort and Jared Kushner, Trump's son-in-law and senior adviser, were also in the meeting.

Kushner is reportedly meeting with the Senate Intelligence Committee next week.

Both panels are investigating Russia's election interference and any potential ties between the Trump campaign and Moscow.