To remove a lawsuit from state court to federal court under the federal removal statute, 28 U.S.C. 1446 requires a defendant to file a notice of removal within 30 days of being served. The Circuit Courts of Appeals are divided regarding how the removal statute should be applied when multiple defendants are served on different days.
The Fourth and Fifth Circuits subscribe to the first-served rule. The Sixth, Eighth, Ninth, and Eleventh Circuits have chosen the later-served rule, giving each defendant 30 days after that defendant is served to remove the case to federal court. The remaining circuits have been silent on the matter.