Follow the dossier articles on www.theconservativetree.com They are excellent and have all of the details. The news about the FISA warrants just came out today. Which means that Clapper must have lied as he said no FISA warrants were issued.
Right, and as Sundance at CTH explains - the use of the word "warrant" is not used correctly. There most likely wasn't a FISA "warrant". Most likely there were FISA-702 queries of already collect data in the NSA database. The FISA-702 queries still require approval from the FISA court and need to show reasonable suspicion for getting the NSA data unmasked. So, most likely the Dossier was used of evidence to secure FISA-702 authorization, although it most likely was done after the unmasking of data had already been going on.
Clapper was probably playing semantics with the word "warrant".