(Olympia, WA) -- The Washington State Supreme Court is considering arguments from both sides regarding whether Initiative 1366 is constitutional. The initiative, which was approved by voters last fall, was later struck down by a lower court. One of the questions being considered is whether the initiative violates the "one topic" rule. I-1366 tells lawmakers they'll face a sales-tax reduction unless they pass a constitutional amendment to require a two-thirds majority to pass a tax increase. The Supreme Court is expected to make its decision on the case in the coming months.