Mississippi Gov. Tate Reeves set special elections on Nov. 4 to replace outgoing Democratic senators John Horhn, David Jordan and House Rep. Orlando Paden.

The special elections are being held because two Mississippi lawmakers were elected as mayor of their cities, and another resigned midway through his term.

Three leading election integrity groups urged the Supreme Court on Thursday to prohibit states from counting mail-in ballots that arrive after Election Day, warning that the practice violates federal law and undermines public trust in elections.

Mississippi Governor Tate Reeves announced Monday that the state will be holding three special elections in November to fill seats vacated across several state districts.

Three candidates are running for Senate District 42 in August’s special primary election. No Democrats are on the ballot, only Republican incumbent Robin Robinson and challengers Randy Robinson and Don Hartness.

The Mississippi governor set dates for four special elections: two for the Mississippi Senate, one for the Mississippi House and one for a county tax collector.