Washington (CNN) – Republican Sen. Ron Johnson of Wisconsin is waging a new battle against Obamacare outside of Congress, hiring a powerhouse attorney and filing a federal lawsuit that could reopen a debate over how lawmakers get their own healthcare.

“This is a lawsuit that I am filing against Katherine Archuleta and the Office of Personnel Management to overturn their ruling that gives members of Congress and their staffs special treatment under the health care law,” Johnson told reporters Monday.  “I think it’s a basic issue of fairness.”

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