Nebraska and Oklahoma are asking the U.S. Supreme Court to declare Colorado's legalization of marijuana unconstitutional.
Nebraska Attorney General Jon Bruning announced Thursday that the states are seeking a court order to prevent Colorado from enforcing a measure that was approved by voters in 2012. Bruning says Oklahoma Attorney General Scott Pruitt is also a party to the lawsuit.
The complaint alleges that Colorado's Amendment 64 runs afoul of federal law.
Washington state also has legalized marijuana, but Bruning says Nebraska isn't suing over that law because it doesn't share a border with Washington.
Colorado Attorney General John Suthers says in a statement that the lawsuit is without merit. He says his office will vigorously defend the marijuana law in the U.S. Supreme Court.
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