Obama criticizes Wisconsin's new 'right-to-work' law, says it will weaken workers

President Barack Obama is criticizing a new Wisconsin law that prohibits requiring workers to pay union dues, saying it "will weaken, rather than strengthen workers."

Wisconsin Gov. Scott Walker signed the measure into law Monday. Walker is expected to run as a Republican candidate for president in 2016.

Obama accuses Walker of claiming "victory over working Americans," and says Walker should do more to help working-class Americans "by taking meaningful action to raise their wages and offer them ... paid leave."

Supporters of the Wisconsin law argued it will help attract new businesses, while opponents said it will drive down wages and make workplaces less safe.

Obama says the new Wisconsin law is part of "a sustained, coordinated assault on unions, led by powerful interests and their allies in government."