Opponents of the law, led by the Massachusetts Family Institute, said they were told Tuesday they had submitted enough voter signatures to put the recall effort on the 2018 ballot.
The law allows transgender people to use bathrooms and locker rooms that correspond to their gender identity.
The Democratic-controlled Legislature approved the bill after years of debate. Republican Gov. Charlie Baker signed it into law in July.
Those pushing the repeal say they’re defending the fundamental rights to privacy and safety, particularly for women and children.
Attorney General Maura Healey and the Massachusetts Commission Against Discrimination have issued guidelines to businesses for complying with the law.
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