Does “triggered” mean the one and only reason???
“In early July 2016, Steele — described by Montoya as a “proven,” “well-regarded” and “known entity” in the intelligence community – approached an FBI associate with a worrisome tale: ...
The allegations Steele laid out to the FBI in July 2016 in the dossier were shocking. They were salacious. And they were completely unverified by the U.S. government — at least at that point.”
http://abcnews.go.com/US/fbi-vets-missing-infamous-dossier-amid-russia-probe/story?id=52309501
Getting a warrant from a secret court IS different. That's the point. But, good to know that ABC is in favor of secretly undertaking surveillance of say, itself, based on nothing more than ludicrous allegations. After all, there is no way to know, for sure, without snooping.