UPDATE: From CBS News' White House, Justice, and legal affairs correspondent:
Politico reported Friday night that the FBI sent letters to three House committee chairmen and turned over to Congress thousands of documents related to the Russia investigation in an effort to ease tensions between Republican lawmakers and the Department of Justice.
The documents provided ... include details about some of the FBI's most sensitive programs, including a file on the FBI's justification to obtain a court-authorized warrant to spy on a former Trump campaign aide in October 2016.
(...)
One FBI letter responded to document requests by House Intelligence Committee Chairman Devin Nunes (R-Calif.) made in August 2017, as well as in March and April. The other was to House Judiciary Committee Chairman Bob Goodlatte (R-Va.) and House Overisght Committee Chairman Trey Gowdy (R-S.C.), who issued an extensive subpoena for records in March.
Files continued to arrive on Capitol Hill as late as Friday, according to the bureau, when the FBI submitted a classified letter to the House Intelligence Committee detailing whether the FBI relied on informants on Russian meddling prior to the official opening of its investigation.
Also on Friday, the FBI turned over more than 1,400 pages of documents to the House Judiciary and Oversight Committees relating to senior FBI or Justice Department officials' requests to review or manage surveillance records that either involve or mention the Trump campaign or Trump administration.
But all of this still was not enough for Nunes, who also served on the Trump transition team and has been a staunch ally of the president to the detriment of his committee.
On Sunday, Nunes sent Deputy Attorney General Rod Rosenstein a letter giving him until 5pm Monday to tell him "whether the FBI used confidential informants 'against' members or associates of the Trump campaign" and who is responsible for responding to his subpoenas.
CNN's Manu Raju reports Nunes not only knows the answers to the questions he's asking but also is selectively deciding when and when not to discuss "committee business."
Among the information Nunes is seeking is documentation on the use of a confidential informant in the early stages of the investigation into the campaign. The use of such sources is common in counterintelligence investigations, but the revelation of the source and his role has ignited outrage on the right. President Trump and his allies have characterized the man as a “spy” planted there by the FBI to undercut his campaign.
The Justice Department has resisted providing information on the informant to the whole of Congress, arguing that it would needlessly expose sensitive sources and methods and endanger lives. It has limited briefings to the Gang of Eight — the top Republican and Democrat in each chamber, as well as the top Republican and Democrat on each of the Intelligence committees.
Nunes on Sunday blasted that limitation as “unacceptable” and said that “the alleged referral of the ‘Committee’s request for transcripts or summaries of conversations between human source(s) and Trump campaign officials’ to the Director of National Intelligence does not relieve the FBI and DOJ from full compliance with the Committee’s subpoena.”
FBI hands House GOP thousands of documents on Russia probe (Politico)