PHILADELPHIA (AP) — Arguments are set in a federal lawsuit that alleges congressional districts in Pennsylvania unfairly give Republicans an electoral advantage.

Court records show that the case brought by five Pennsylvania voters against the governor and elections officials heads to federal court in Philadelphia on Tuesday.

Last week, the U.S. Supreme Court declined to halt the lawsuit after Republican legislative leaders argued that the case could occur as the justices are considering a Wisconsin gerrymandering case with "substantively identical claims."

Republicans won 13 of 18 congressional seats in the 2014 and 2016 elections despite earning a little over 50 percent of the vote.

They say their maps are lawful.

Pennsylvania is considered to be one of the most gerrymandered states.

The lawsuit seeks to redraw the lines before the 2018 midterm election.