A liberal group has filed a third challenge to portions of Michigan's election laws, contesting rules governing how people can register to vote in the two weeks before an election.
The suit brought Friday is related to a 2018 ballot initiative that expanded voting options.
Priorities USA says the Republican-led Legislature last year imposed "onerous restrictions" on those registering in person and was wrong to not let voters register at polling places on Election Day.
The lawsuit also challenges a policy adopted by Democratic Secretary of State Jocelyn Benson that excludes teens younger than 17 1/2 years old from being automatically registered to vote when they get their driver's license.
It is the third suit filed by Priorities USA in battleground Michigan over roughly a two-week span.