the trump dossier investigation. chairman devin nunes posed a string of dossier related questions, covering when officials learned the dnc and clinton campaign paid for the research. as well as how they dossier was used to secure one or more surveillance warrants. fox news learned the questionnaire, including a threat to subpoena, went to former fbi director james comey, former director of national intelligence james clapper and former cia director john brennan. the republican staff memo released this month said fbi and justice department knew about the dossiers democratic roots. it asked the court to collect trump campaign aide carter page's communications. a year later, john brennan testified he didn't know the whole dossier story. >> director brennan, do you know who commissioned the steele dossier? >> i don't. >> do you know if the bureau relied on the steele dossier is part of any court filings,