The FISA applications were never verified for accuracy

In National Review, Andrew McCarthy tells us,

A salacious Clinton-campaign product was the driving force behind the Trump–Russia investigation.

On a sleepy summer Saturday, after months of stonewalling, the FBI dumped 412 pages of documents related to the Carter Page FISA surveillance warrants — the applications, the certifications, and the warrants themselves. Now that we can see it all in black and white — mostly black, as they are heavily redacted — it is crystal clear that the Steele dossier, an unverified Clinton-campaign product, was the driving force behind the Trump–Russia investigation.

Were the allegations thoroughly vetted and confirmed by proof independent of Steele before being presented to the FISA court — which is what common sense and the FBI’s own manual mean by “verified”?

No, they were not.

...If Steele had been corroborated, rest assured that the bureau would not be suffering in silence.

...Steele has not been in Russia for about 20 years. In connection with the dossier allegations, he was merely the purveyor of information from the actual sources — unidentified Russians who themselves relied on hearsay information from other sources (sometimes double and triple hearsay, very attenuated from the supposed original source).

...The FBI (and, I’m even more sad to say, my Justice Department) brought the FISA court the Steele-dossier allegations, relying on Steele’s credibility without verifying his information.

Read more here.