from November 7, 2016:
Two separate sources with links to the counter-intelligence community have confirmed to Heat Street that the FBI sought, and was granted, a FISA court warrant in October, giving counter-intelligence permission to examine the activities of U.S. persons in Donald Trumps campaign with ties to Russia.
Contrary to earlier reporting in the New York Times, which cited FBI sources as saying that the agency did not believe that the private server in Donald Trumps Trump Tower which was connected to a Russian bank had any nefarious purpose, the FBIs counter-intelligence arm, sources say, re-drew an earlier FISA court request around possible financial and banking offenses related to the server. The first request, which, sources say, named Trump, was denied back in June, but the second was drawn more narrowly and was granted in October after evidence was presented of a server, possibly related to the Trump campaign, and its alleged links to two banks; SVB Bank and Russias Alfa Bank. While the Times story speaks of metadata, sources suggest that a FISA warrant was granted to look at the full content of emails and other related documents that may concern US persons...
The FISA warrant was granted in connection with the investigation of suspected activity between the server and two banks, SVB Bank and Alfa Bank. However, it is thought in the intelligence community that the warrant covers any US person connected to this investigation, and thus covers Donald Trump and at least three further men who have either formed part of his campaign or acted as his media surrogates. The warrant was sought, they say, because actionable intelligence on the matter provided by friendly foreign agencies could not properly be examined without a warrant by US intelligence as it involves US Persons who come under the remit of the FBI and not the CIA. Should a counter-intelligence investigation lead to criminal prosecutions, sources say, the Justice Department is concerned that the chain of evidence have a basis in a clear warrant.
In June, when the first FISA warrant was denied, the FBI was reportedly alarmed at Carter Pages trip to Moscow and meetings with Russian officials, one week before the DNC was hacked. Counter intelligence agencies later reported to both Presidential candidates that Russia had carried out this hack; Donald Trump said publicly in the third debate that our country has no idea if Russia did the hacking. The discovery of the Trump Tower private Russian server, however, communicating with Alfa Bank, changed matters, sources report.
read more: https://heatst.com/world/exclusive-fbi-granted-fisa-warrant-covering-trump-camps-ties-to-russia/
...the buzz is that the warrant granted for the server connected to Russian banks was left open expanded to other incidents of Russian contacts and involvement.