He’s the FISA Court who issued the original warrant to spy on Carter Page.
“I’m still rather curious on whether we will ever find out why Judge Contreras, a friend of FBI agent Peter Strzok, was recused from the case immediately after accepting the plea on November 30th, 2017.”
“Rudolph Contreras was the FISA Judge who issued a warrant to spy on Carter Page because of a Yahoo News article and a Phony Dossier. Guess who appointed Contreras to the FISA Court? Barack Hussein Obama.” https://truthfeednews.com/just-in-judge-who-granted-fisa-warrant-tied-to-obama/
Correction: “Fisa Court judge.”