Rep. Jason Chaffetz (R-UT), chairman of the Oversight and Government Reform Committee, issued a subpoena to top FBI official Jason Herring on Monday for every document related to the bureau’s investigation into Hillary Clinton’s use of a private email server while she was secretary of state.

Chaffetz grilled Herring, the acting assistant director for congressional affairs, and the six other government officials in the Congressional hearing Monday.

Chaffetz said his committee shouldn’t have to issue a subpoena to see unclassified information.

On July 7, FBI Director James Comey told the House Committee that his agency would provide to Congress whatever it can under the law and under bureau policy.

A month later, the FBI handed over several documents relating to its investigation of Clinton’s email server. However, many of those documents were unclassified and redacted. Chaffetz insisted that the partial documents provided are now preventing Congress from properly overseeing the Obama administration.

Chaffetz chided the witnesses Monday, noting that there is no legal basis for the redactions included in the files turned over in August.

Last Friday, the FBI released a heavily redacted 58-page report that revealed, among other things, how then-Secretary of State Hillary Clinton lost several mobile phones carrying e-mails containing classified information.

The FBI investigation further contradicted Clinton’s repeated claim that she didn’t send or receive classified emails. The FBI investigation found more than 80 email chains that included some form of classified information, including “top secret” markings.

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