Petition of the day

Issues:(1) Whether the substantial[ity] and federal-state balance requirements ofGrable & Sons Metal Products, Inc. v. Darue Engineering & Manufacturingare satisfied whenever a federal law standard is referenced to inform the standard of care in a state-law cause of action, so long as the parties dispute whether federal law embodies the asserted standard; and (2) whether a federal court applyingGrableto a case removed from state court must accept a colorable, purely state-law claim as sufficient to establish that the case does not necessarily raise a federal issue, even if the court believes the state court would ultimately reject the purely state-law basis for the claim on its merits.