House Science Committee Chairman Lamar Smith (R-Texas) on Tuesday issued a subpoena to FBI Director James Comey for documents related to Hillary Clinton Hillary Diane Rodham ClintonJoe Biden looks to expand election battleground into Trump country Biden leads Trump by 12 points among Catholic voters: poll The Hill's Campaign Report: Biden goes on offense MORE’s personal email server.

Smith, along with Sen. Ron Johnson Ronald (Ron) Harold JohnsonThis week: Supreme Court fight over Ginsburg's seat upends Congress's agenda GOP set to release controversial Biden report Democrats fear Russia interference could spoil bid to retake Senate MORE (R-Wis.), earlier this month sent a letter to Attorney General Loretta Lynch asking that the Justice Department turn over notes and related materials for interviews conducted with the IT team that oversaw Clinton’s server.

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But the department failed to produce the requested documents by the Sept. 16 deadline detailed in the letter. The FBI now has until Sept. 26 to answer the subpoena.

Smith is investigating the security protections in place on Clinton’s server to determine if “amendments” to a certain federal cybersecurity framework are necessary.

“The committee is convinced that former Secretary Clinton’s unusual server and network arrangement necessitates amendments to the Federal Information Security Modernization Act of 2014 (FISMA),” according to a release.

“The Committee continues to have questions about the structure and security of the email system used by former Secretary Clinton and whether she and her staff employed cybersecurity standards required by FISMA.”

The committee is seeking information about the FBI’s interviews with Bryan Pagliano, Justin Cooper and employees of the Denver-based firm that maintained Clinton’s server, Platte River Networks.

Pagliano, a former State Department IT technician, set up the server for Clinton. Cooper, a former senior advisor to President Bill Clinton William (Bill) Jefferson ClintonGOP brushes back charges of hypocrisy in Supreme Court fight Battle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates MORE, registered the clintonemail.com domain.

Pagliano and two Platte River Networks engineers, Paul Combetta and Bill Thornton, recently invoked their Fifth Amendment rights when subpoenaed to testify about the server before the House Oversight Committee.

Separately, Smith threatened Tuesday to subpoena Platte River Networks if Combetta and Thornton do not submit to transcribed interviews with the committee by Friday.

The Committee has also issued a subpoena to Platte River Networks and two other firms associated with Clinton’s server for information on the structure and security of the email system.

The three tech firms — Platte River Networks, network security firm SECNAP and the data backup provider Datto Inc. — failed to comply with repeated requests for information on Clinton’s email setup, arguing they did not have Clinton’s consent.

Democrats have accused Smith of “abusing the Committee’s investigatory powers to brazenly do the bidding of the Trump campaign," according to an August statement from Science Committee Ranking Member Eddie Bernice Johnson (D-Texas).