"Republicans argue that the D.C. Circuit doesnt need any more judges. The current court has eight sitting judges divided evenly between Democratic and Republican appointees. There are also six senior judges, including five GOP appointees, who help decide some cases.
http://www.csmonitor.com/USA/DC-Decoder/2013/1121/How-new-Senate-filibuster-rule-could-change-balance-of-power-on-courts-video