The FBI relied heavily on the dubious Steele dossier, as well as a Yahoo! News article based on the salacious document, to obtain a surveillance warrant against a Trump campaign adviser prior to the 2016 election, according to an explosive but controversial memo approved for release by the White House on Friday.

The memo, which was crafted by House Republicans, also says that the FBI’s deputy director, Andrew McCabe, told Congress that a FISA warrant against the campaign adviser, Carter Page, would not have been granted without use of the dossier. That despite the FBI later determining that very little of the Democrat-funded document was corroborated.