It's the final day for Michigan residents who want to participate in the Aug. 7th primary election to register to vote.
Monday is the deadline to register for the primary, which will feature contests between members of one party vying for the same position.
Four Republicans are running for the chance to challenge Democratic U.S. Sen. Debbie Stabenow.
Races for U.S. House and others also will be on the ballot.
Voters can register by mail, at their local clerk's office or by visiting a secretary of state office.
To check their registration status, voters can visit the Michigan Voter Information Center online.
The site includes a sample ballot for the races in voters' districts and a map to their local polling places.