The famous "dossier" on Donald Trump – supposedly compiled by British ex-MI6 spook Christopher Steele, acting as a contractor for Glenn Simpson and Fusion GPS, themselves contractors for the Hillary Clinton campaign – "salacious and unverified" though it might have been, was "crucial" to the FBI's efforts to obtain the original FISA on Carter Page as well as the three renewals of that FISA.  That the "dossier" was "salacious and unverified" we have on the authority of disgraced former FBI director James Comey, and that it was "crucial" to the Carter Page FISA is attested by the equally disgraced former deputy...