The following excerpt is from United States ex rel. Hayes v. Allstate Ins. Co., 853 F.3d 80 (2nd Cir. 2017):
Because "every federal appellate court has a special obligation to satisfy itself not only of its own jurisdiction, but also [of] that of the lower courts in a cause under review," we will consider the non-FedEx defendants' contention that the district court lacked subject matter jurisdiction. Arnold v. Lucks , 392 F.3d 512, 517 (2d Cir. 2004) (internal quotation marks omitted).
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