This (GW Bush appointed) district court judge took senior status back in March 2019 but Trump has not yet nominated a replacement. Perhaps because of the existence of the Blue Slip process for District judges.
LINDSEY GRAHAM needs to get rid of that process which is allowing one or two Senators to extra-Constitutionally VETO Trump District Court nominees IN CRITICAL SPOTS. If we have more Trump judges we’ll have fewer Agendanista decisions such as this one.
I think Trump and McConnell have done away with the Blue Slip process. See https://www.judiciary.senate.gov/press/dem/releases/feinstein-urges-return-to-blue-slip-tradition