If you listen to Intel Committee Chair Devin Nunes public interviews in the exact time-line sequence, from March 22nd to now, a clear picture emerges. The “tipster” source is unknown. However, the actual intelligence report(s) he reviewed, which contained the unmasked surveillance information, was simply President Obama’s daily intelligence Briefing(s). It appears, most likely, someone (aka mysterious tipster), simply told Nunes which dates to review. Hence the Executive Branch SCIF was utilized. The ACTUAL intelligence product itself was the Executive Office Presidential Daily Intelligence Briefing. Most likely a Clapper (ODNI), Rogers (NSA), Comey (FBI Counter Intel), and Brennan (CIA) work...