Sorry Brit. They relied on the fake dossier as prime evidence for the request. People holding official government positions signed an affidavit declaring that they had reviewed and verified the dossier information included in the FISA application. The use of the dossier itself was improper because the FBI didn't verify it, but claimed they did. Therefore, the FISA warrant request was illegal. Not to mention the fact that they never divulged to the Judges the fact that a foreign agent had created the dossier, paid for by Hillary's campaign.
It is one thing where they signed an affidavit as having reviewed and verified the information contained therein, but didn’t really didn’t review and/or verify.
It is another thing where they signed an affidavit knowing that information therein was false, or could reasonably be false.
With the number of signatures on the FISA application, it is possible that some signers belonged to former and some belonged to the latter. The latter are the ones that need to be identified and legal action taken against.