Nunes, who despite stepping aside from directing the House Russia investigation has been leading his own separate investigation, accused Sessions and the FBI of stonewalling him repeatedly in a September 1 letter obtained by CNN. In the letter, he threatened to drag Sessions and FBI Director Christopher Wray before the committee for a public grilling and hold them in contempt of Congress -- a jailable offense -- if they don't hand over the documents.

The House intelligence committee issued a pair of subpoenas last month seeking documentation of whether the FBI or Justice Department used material from the dossier compiled by former British intelligence agent Christopher Steele as part of the federal investigation into possible collusion between the campaign of President Donald Trump and the Kremlin. Nunes also writes that he subpoenaed to discover whether information from the Russia dossier was used in the crafting of applications to conduct surveillance under the Foreign Intelligence Surveillance Act.

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