Amazon is taking a fight over sales tax in the state of New York to the U.S. Supreme Court. Exactly why is a little unclear. The online retailer on Friday filed documents to appeal the issue to the nation’s highest court, arguing that Amazon customers shouldn’t be subject to sales tax in New York because the Seattle company’s operations there aren’t substantial enough to trigger the levies. The document was filed by the Washington D.C. law firm Gibson Dunn & Crutcher, whose partner Ted Olson is a former U.S. solicitor general and took part in the Bush v. Gore battle following the 2000 election. The Financial Times reported the move earlier. What seems odd about the filing is that Amazon has brokered deals with a variety of states–or chosen not to fight–allowing sales tax collection there.