The Nationals claimed Mills off waivers from the Dodgers on Thursday and optioned him to Triple-A Rochester.
The right-hander was pushed off the Dodgers' 40-man roster Monday following the acquisition of catcher Hunter Feduccia, but Mills has found a new home. He's turned in a 2.41 ERA and 1.11 WHIP in 37.1 innings at Triple-A, but he coughed up four runs in just 6.1 innings while posting a 5:9 K:BB during his time in the majors this season.