The ranking Republican on the House Intelligence Committee revealed more details about the now-concluded special counsel investigation’s guidelines, saying on Thursday that Mueller’s second scope memo was based on the unverified Steele dossier nearly in its entirety.

Rep. Devin Nunes, R-Calif., told Fox News he’d reviewed still-classified materials related to then-Deputy Attorney General Rod Rosenstein’s memos outlining the breadth of special counsel Robert Mueller’s Trump-Russia investigation. He said the bulk of the information in the second scope memo came from the dossier compiled by British ex-spy Christopher Steele, the former MI6 agent who was hired by the opposition research firm Fusion GPS through funding from the Clinton campaign and the DNC during the 2016 presidential campaign.