business group say monday ask u.s. supreme court hear appeal lower-court rule toss challenge part seattle law increase minimum wage international franchise association bring lawsuit city june 2014 say law favor independent businesses require franchise like mcdonald burger king phase new 15 minimum wage quickly appeal never seek prevent city seattle wage law go effect association president robert cresanti say statement appeal supreme court focus solely discriminatory treatment franchise seattle wage law motivation discriminate interstate commerce say association lawsuit challenge law treatment franchise subsidiaries parent company rather completely separate businesses representatives city could immediately reach comment comment lawsuit last year seattle mayor ed murray democrat champion wage hike say rather invest lawyers prevent workers earn high wag time large businesses begin invest high minimum wage employees federal judge last march deny group lawsuit say fail back discrimination claim 9th u.s. circuit court appeal uphold decision september law take effect april last year require businesses seattle 500 employees nationwide raise minimum wage 15 2018. small company 2021. seattle among number large u.s. cities pass laws raise minimum wage 10 hour franchise association lawsuit could impact cities like chicago san francisco association say expect supreme court say spring whether would take case franchise appeal seattle minimum wage case u.s. supreme court