At this time, you have no idea what was presented to the judge.( Other than an admittedly partisan memo from a guy who hasn't seen the underlying data} My guess is that there was plenty of probable cause to issue the warrant, and extend it. It is not obvious to me that the FBI and DOJ are compromised, democrat deep state Trump haters. I still believe that they were looking a people with unusual Russian ties. A couple of convictions later, I am even more convinced. I guess we shall see.