The state House has passed a controversial right-to-work bill and sent it to the state Senate.
Under the constitution, the Senate cannot vote on it for at least five days.
Democrats returned to the House floor for the vote after walking out earlier in protest of the legislation.
Earlier, Michigan State Police said they used pepper spray on right-to-work protesters who to tried rush into the Senate chamber at the state Capitol. That had minority Democrats in the Legislature accusing Republican leaders of taking a "shameful step" to undermine free speech.
State police Inspector Gene Adamczyk says eight people were arrested for resisting and obstructing when they tried to rush past two troopers guarding the Senate door today.