Source for denial of FISA warrant?
My understanding is that the application was made in October 2016. By that time the Trump campaign had disassociated itself from Page.
If you have information that indicates a different timeline I'd like to see it.
http://theweek.com/speedreads/672504/famously-agreeable-fisa-court-reportedly-turned-down-fbi-request-monitor-trump-officials
The Guardian has learned that the FBI applied for a warrant from the foreign intelligence surveillance (FISA) court over the summer in order to monitor four members of the Trump team suspected of irregular contacts with Russian officials. The FISA court turned down the application, asking FBI counter-intelligence investigators to narrow its focus. According to one report, the FBI was finally granted a warrant in October, but that has not been confirmed, and it is not clear whether any warrant led to a full investigation. [The Guardian]