Oh hey, look, another lie by Oreo. Shocking. It's an undisputed fact that the Steele Dossier was used as grounds for the Carter Page FISA warrant. That was long before the "Russian Investigation". Nobody disputes this. Not even the Dumbocrats.Steele's Dossier file was given to John McCain and then he hand delivered to James Comey--MONTHS after the Russian investigation started. The Dossier file showed up late December 2016/early January 2017.
Furthermore, the Steele Dossier was commissioned by the Clinton campaign and was handed over to the Perkins Coie law firm (the Clinton campaign needed attorney/client "privilege" to hide behind during their collusion). Again - not even the Dumbocrats dispute this series of events.
It was not used as the sole grounds. The fact is that our intelligence agencies had proof of Russian interference even before the dossier. They briefed Mike Pence and he said the evidence was convincing.