The release offered a rare glimpse of national security wiretap files and raised echoes of a fight in February over the Russia inquiry between Republicans and Democrats on the House Intelligence Committee.
WASHINGTON — The Trump administration disclosed on Saturday a previously top-secret set of documents related to the wiretapping of Carter Page, the onetime Trump campaign adviser who was at the center of highly contentious accusations by Republicans on the House Intelligence Committee that the F.B.I. had abused its surveillance powers.
Democrats in February rejected the Republican claims that law enforcement officials had improperly obtained a warrant to monitor Mr. Page, accusing them of putting out misinformation to defend President Trump and sow doubts about the origin of the Russia investigation. But even as Republicans and Democrats issued dueling memos characterizing the materials underlying the surveillance of Mr. Page, the public had no access to the records.
On Saturday evening, those materials — an October 2016 application to the Foreign Intelligence Surveillance Court to wiretap Mr. Page, along with several renewal applications — were released to The New York Times and other news organizations that had filed Freedom of Information Act lawsuits to obtain them. Mr. Trump had declassified their existence earlier this year.
“This application targets Carter Page,” the document said. “The F.B.I. believes Page has been the subject of targeted recruitment by the Russian government.” A line was then redacted, and then it picked up with “undermine and influence the outcome of the 2016 U.S. presidential election in violation of U.S. criminal law. Mr. Page is a former foreign policy adviser to a candidate for U.S. president.”
Mr. Page has denied being a Russian agent and has not been charged with a crime in the nearly two years since the initial wiretap application was filed. He did not immediately respond to a request for comment on Saturday.
The spectacle of the release was itself noteworthy, given that wiretapping under the Foreign Intelligence Surveillance Act, or FISA, is normally one of the government’s closest-guarded secrets. No such application materials had apparently become public in the 40 years since Congress enacted that law to regulate the interception of phone calls and other communications on domestic soil in search of spies and terrorists, as opposed to wiretapping for ordinary criminal investigations.
The documents made public on Saturday were heavily redacted in places, and some of the substance of the applications had already become public in February, via the Republican and Democratic Intelligence Committee memos.
Visible portions showed that the F.B.I. in stark terms had told the intelligence court that Mr. Page “has established relationships with Russian government officials, including Russian intelligence officers”; that the bureau believed “the Russian government’s efforts are being coordinated with Page and perhaps other individuals associated with” Mr. Trump’s campaign; and that Mr. Page “has been collaborating and conspiring with the Russian government.”