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 TrumpCould Donald Trump and Boris Johnson be this generation's Reagan-Thatcher? Merkel backs Democratic congresswomen over Trump How China's currency manipulation cheats America on trade MORE to testify before the committee next week. 

Sens. Chuck GrassleyCharles (Chuck) Ernest GrassleyScandal in Puerto Rico threatens chance at statehood Poll: McConnell is most unpopular senator Democrat: Treasury 'acknowledged the unprecedented process' in Trump tax return rejection MORE (R-Iowa) and Dianne FeinsteinDianne Emiel FeinsteinTop Democrats demand security assessment of Trump properties Democrats warm to idea of studying reparations Hillicon Valley: Senators unload on Facebook cryptocurrency plan | Trump vows to 'take a look' at Google's ties to China | Google denies working with China's military | Tech execs on defensive at antitrust hearing | Bill would bar business with Huawei 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 ClintonPoll: Majority of Democratic voters happy with their choices among 2020 contenders No presidential candidate can unite the country GOP lawmakers speak out against 'send her back' chants 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.