“Time of filing” rule depends on – where filed.

In 16 Front Street v. Mississippi Silicon, the Fifth Circuit addressed a fundamental issue about federal question subject matter jurisdiction, with surprisingly little guidance in the current case law. A plaintiff sued in federal court under the Clean Air Act; in response to the trial judge’s concerns  about subject matter jurisdiction, the plaintiff amended to add a new defendant and invoke another provision of that Act. The Fifth Circuit concluded that while this amendment could be problematic in a removed case under the “time-of-filing” rule, it did not present that problem when the case was initially filed in federal court and did not implicate the removal statute. The Court’s analysis involves two important Supreme Court – Mollan v. Torrance, 22 U.S. 537 (1824), in which Chief Justice Marshall first stated the “time-of-filing” rule (albeit, in a diversity case), and Caterpillar, Inc. v. Lewis, 519 U.S. 61 (19960, a recent treatment of a “cure” of a problem with subject matter jurisdiction. No. 16-60050 (March 30, 2018).