Gov. Rick Snyder is preparing to sign into law changes to the state's teacher tenure system that supporters say will make it easier to remove ineffective teachers from the classroom.
Supporters say the legislation to be signed Tuesday makes teacher performance rather than seniority the key factor in awarding tenure and deciding layoffs within a district.
Democrats say the proposals are part of a continued legislative attack on teachers and union rights and won't improve the state's schools.
Teachers already are reeling from state budget cuts to education that could force layoffs in many districts headed into the next academic year.
GOP lawmakers also are working on legislation that would require many teachers and other public employees to pay a larger share of their own health insurance costs.