(Reuters) -A union that represents 150,000 U.S. government employees filed a lawsuit on Monday seeking to block President Donald Trump from stripping hundreds of thousands of federal workers of the ability to collectively bargain with government agencies through their unions.

The National Treasury Employees Union said in the lawsuit filed in Washington, D.C. federal court that Trump’s executive order last week exempting more than a dozen agencies from collective bargaining obligations violates federal workers’ labor rights and the U.S. Constitution.

(Reporting by Daniel Wiessner in Albany, New York)