Lawyers for Glenn Simpson, co-founder of Fusion GPS, told the head of the House Judiciary Committee on Thursday that his client will “invoke his constitutional rights not to testify,” defying a GOP-issued subpoena seeking to compel him to give a closed-door deposition.

The lawyers told Judiciary Committee Chairman Bob Goodlatte Robert (Bob) William GoodlatteNo documents? Hoping for legalization? Be wary of Joe Biden Press: Trump's final presidential pardon: himself USCIS chief Cuccinelli blames Paul Ryan for immigration inaction MORE (R-Va.) in an electronic letter that Simpson will not participate in the committee’s inquiry because it “is not designed to discover the truth.”

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“Consistent with the September 27, 2018 letter we sent to you, Mr. Simpson, whose testimony is a matter of public record, will not be participating in a confidential deposition before this Committee,” lawyers for Simpson wrote, according to a copy of the letter obtained by The Hill. “He will instead invoke his constitutional rights not to testify under the First and Fifth Amendments of the Constitution.”

The lawyers, who declined the committee’s initial request for an interview late last month, blasted the joint investigation being led by Judiciary and the House Oversight and Government Reform committees as a partisan-driven probe aimed at undermining the ongoing investigation into Russian interference in the 2016 presidential campaign.

In the latest scathing letter, the lawyers continued to slam the committee — marking a departure from the otherwise typically quiet approach that most lawyers and witnesses involved in this joint probe have taken.

“The obvious — and at times explicitly stated — goal of this Committee is to discredit and otherwise damage witnesses to Russia’s interference in the 2016 election, all as part of an effort to protect a President who has sought to placate and curry favor with a hostile foreign power and who demands that the Justice Department stop investigating him,” they wrote.

The lawyers accused the panels' Republicans of seeking to “ruin the reputations of some of the government’s most dedicated and experienced civil servants,” in an attempt to “weaken the independence of this Justice Department.”

The letter, in particular, pointed to the attacks by some of the conservative House members against former British spy Christopher Steele and current Justice Department official Bruce Ohr, who was recently interviewed by the committees' investigators behind closed doors.

Simpson, a former journalist who later co-founded Fusion GPS, hired Steele to help compile the dossier, which makes a series of salacious allegations about President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE’s possible ties to Russia.

The opposition research against Trump was funded in part by Hillary Clinton Hillary Diane Rodham ClintonDemocratic groups using Bloomberg money to launch M in Spanish language ads in Florida The Hill's Campaign Report: Presidential polls tighten weeks out from Election Day More than 50 Latino faith leaders endorse Biden MORE's campaign — a flashpoint for Republicans who have pointed to ties between the opposition research firm and top federal officials as evidence to support their claims that there was bias against Trump among the top brass at the FBI and Department of Justice.

Some conservative House members have alleged that a contractor working for Simpson's firm, Nellie Ohr, could have passed the dossier on to her husband, Bruce Ohr, who worked as a top official with the Department of Justice during the election.

The letter said that going after these officials has “deprived our country of their able assistance in the increasingly urgent fight against foreign interference with our democracy," praising Steele and Ohr.

“For example, this Committee has sought to depict the relationship between Christopher Steele and Bruce Ohr — one of the UK’s top experts on Russia and one of the Justice Department’s leading experts on Russian organized crime — as somehow scandalous, when we should all want these two experts to share information in order to make us safer,” they wrote.

The letter quickly stoked anger among Republicans on the committees.

“It is very telling when Glenn Simpson has talked to multiple reporters and multiple individuals at the Department of Justice over the last two years. When the day of reckoning is on the horizon, he chooses to lose his voice,” Rep. Mark Meadows Mark Randall MeadowsThe Hill's Morning Report - Sponsored by Facebook - GOP closes ranks to fill SCOTUS vacancy by November House moves toward spending vote after bipartisan talks House Democrats mull delay on spending bill vote MORE (R-N.C.), one of the staunchest critics of the FBI and Justice Department, told The Hill.

“This Committee has repeatedly interviewed witnesses in secret, only to selectively leak from the interviews to disparage those witnesses and promulgate a patently false narrative,” the lawyers wrote.

Simpson, who has already met with three congressional committees, is one of a number of witnesses tied to the dossier that Republicans have sought to interview as part of their joint investigation.

Congressional investigators are expected to interview Nellie Ohr next week.

2018.10.11 Letter to Goodlatte on Scribd