Hillary Clinton's campaign and the Democratic National Committee helped fund the research that resulted in the so-called "Trump dossier" that contained scandalous material tying President Trump to Russia, according to a report Tuesday.

Fusion GPS, a Washington opposition research firm, was hired by the Clinton campaign and DNC lawyer Mark Elias to oversee the research, the Washington Post reported citing unnamed sources. Fusion GPS then hired former British intelligence officer Christopher Steele, who wrote the dossier.

Elias and Perkins Coie, his law firm, hired Fusion GPS in April 2016 to do research for the Clinton campaign and the DNC. Fusion GPS had already been conducting research on Trump during the Republican primaries, funded by an unknown Republican client.

The Clinton campaign and the DNC financed Fusion GPS's research up until just days before the Nov. 8 election.

The report comes after President Trump urged the Justice Department and the Federal Bureau of Investigation to "immediately" release any information they might have on who paid for the dossier.

"Officials behind the now discredited 'Dossier' plead the Fifth. Justice Department and/or FBI should immediately release who paid for it," Trump tweeted Saturday afternoon.

The tweet followed a House Intelligence Committee hearing last week with Fusion GPS, where the company used their Fifth Amendment rights to not respond to questions, according to a lawyer representing them.

It was also revealed Saturday that chairman of the House intelligence panel, Rep. Devin Nunes issued a subpoena on Fusion GPS's bank record to gain information regarding funding of the dossier. Fusion GPS asked a judge to stop the bank from obeying the subpoena.

Some aspects of the dossier — like communications between foreign nationals noted in the dossier — have been confirmed by officials; however, the majority of the scandalous allegations included in the document have not been verified.

The dossier came to light publicly after it was published in full by Buzzfeed in January.