The rule is that the federal supreme court rules on issues concerning the federal constitution, and the state supreme courts rule on issues concerning the state constitution. So in any question of the constitutionality of a law set forth by the state legislature, it would be the state supreme court to hear the case.
But we have had judicial overreach before, in 2000, when the supreme court butted into a purely state matter and stopped the recount. This could be a litmus test for the new court. I am wholly in favor of a conservative court, if conservative means they don't reinterpret the constitution to find new "rights", but ty to stay close to original intent. A conservative court that is an arm of the GOP, that is not the kind of conservative this country needs.
Saying that, if this court overreaches it's authority like it did on 2000, in order to help Trump, that will not be a good thing.