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Charter challenges are piling up against an Ontario government law capping public sector wage increases.

A coalition of 10 unions representing more than 250,000 workers announced on Tuesday that they are planning a joint constitutional challenge.

The Ontario Nurses’ Association also announced it is launching its own court case against the legislation, arguing it infringes on collective bargaining rights.

The announcements come days after the major teachers’ unions filed three separate court challenges.

The law caps all public sector salary increases at 1 per cent a year for the next three years.

Treasury Board President Peter Bethlenfalvy has said he is confident the law is constitutional.

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