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DETROIT (AP) -- United Auto Workers President Bob King says a coalition of unions will push for an amendment to the Michigan Constitution that bars so-called "right-to-work" legislation outlawing contracts that require employees to join unions.

Republicans who control the state Legislature have been pushing for a law that would ban labor agreements with mandatory union dues. Republican Gov. Rick Snyder has said the issue is not a priority for his administration.

King told about 1,000 people at the UAW's national convention in Washington on Thursday that a union coalition will push for a November ballot issue protecting the right to have union shops.

The Detroit News reports King says unions agreed on the drive at a meeting Wednesday. He says they'll seek 500,000 signatures, about twice what's needed.