Michigan voters hit the polls Tuesday to cast their ballots in the state-run primary, with both Republicans and Democrats making their pick for their party’s 2024 nominee.

Polls are open from 7 a.m. to 8 p.m. local time. Most of the state runs on Eastern Standard Time, but four counties in the Upper Peninsula observe Central Time.

Democrat primary voters can choose from President Biden and his challengers, Rep. Dean Phillips of Minnesota and author Marianne Williamson. Those voters will also have the option to cast an “uncommitted” vote.

Meanwhile, Republican voters on Tuesday will have their choice from former President Trump and former South Carolina Gov. Nikki Haley, the only two GOP candidates left in the race, and others who have since dropped out, including former New Jersey Gov. Chris Christie, Florida Gov. Ron DeSantis, businessman Vivek Ramaswamy and former Arkansas Gov. Asa Hutchinson. There are 16 delegates at stake.

Michigan’s Democrat-controlled legislature set the state’s primary date earlier than usual this year to comply with the wishes of the Democratic National Committee. But shifting the date for the Democrats pushed the Republicans out of compliance with the Republican National Committee (RNC).

To avoid a penalty from the RNC, Michigan Republicans came up with a split-primary system, with voters casting ballots on Tuesday and on March 2.

On Saturday, the Michigan GOP will hold a party-run convention in Detroit. The winner of that contest could receive up to 39 delegates, although they will be distributed by district. There are 13 total districts and three delegates per district.

During that contest, voters only have the choice between Trump and Haley.

Michigan has a total of 55 pledged delegates.