President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE on Thursday questioned who paid for a controversial and unverified dossier about his alleged connections to Russia.

“Workers of firm involved with the discredited and Fake Dossier take the 5th. Who paid for it, Russia, the FBI or the Dems (or all)?” Trump asked on Twitter.

Workers of firm involved with the discredited and Fake Dossier take the 5th. Who paid for it, Russia, the FBI or the Dems (or all)? — Donald J. Trump (@realDonaldTrump) October 19, 2017

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The tweet from the president comes after Fox News reported Wednesday that two officials from Fusion GPS, the political research firm behind the dossier, took the Fifth Amendment in front of the House Intelligence Committee.

The House Intelligence Committee last week subpoenaed the political research firm. The dossier was compiled by former MI6 officer Christopher Steele.

"We cannot in good conscience do anything but advise our clients to stand on their constitutional privileges, the attorney work product doctrine and contractual obligations," Fusion GPS's counsel, Josh Levy, wrote in a letter to the committee obtained by Business Insider earlier this week.

The attorney said the subpoenas violated "the First Amendment rights" of the firm's three founders, adding that they would prevent future candidates "from conducting confidential opposition research in an election."

"Should you compel any of our three clients to appear at the scheduled deposition, they will invoke their constitutional privileges not to testify," Levy said. "Since that will be the case, we ask that the Committee excuse them from appearing."