BuzzFeed has subpoenaed U.S. intelligence agencies for records of an unverified intelligence dossier about President Trump said to have been collected during last year's presidential campaign.

According to a report by Politico Friday, BuzzFeed, the online news outlet, sent demands Thursday to the CIA, the FBI and the Office of the Director of National Intelligence seeking details on the dossier.

Politico says BuzzFeed is also seeking testimony related to the dossier from fired FBI Director James Comey, as well as former DNI James Clapper and former CIA Director John Brennan.

BuzzFeed issued the subpoenas in connection with a libel suit the site is facing from Russian technology executive Aleksej Gubarev over BuzzFeed's decision to publish the intelligence dossier in its entirety in January.

Most major media outlets only reported on the existence of the unsubstantiated dossier — leaving out specific details — after the chiefs of America's intelligence agencies in January presented then-President-elect Trump with a summary of the dossier.

BuzzFeed published the dossier in full.

The author of the memos is Christopher Steele, a former British intelligence officer with MI-6, who once served in Moscow. Steele was paid by Republican rivals and later by Hillary Clinton supporters to compile the information as opposition research.

The dossier, among other things, says that Russian officials tried to influence Trump by preparing to blackmail him with sex tapes and bribe him with business deals.