WASHINGTON — Oklahoma joined 20 other states Tuesday in a legal challenge to a federal rule making millions more white- collar workers eligible for overtime pay.

The states claim the rule, set to go into effect Dec. 1, will raise their payroll costs to the point that state services will have to be reduced.

“This is yet another example of the administration's ongoing efforts to reach beyond its constitutional authority, ultimately costing Oklahomans their jobs and the state millions of dollars,” Oklahoma Attorney General Scott Pruitt said.

The lawsuit was filed in Texas.