The National Treasury Employees Union, a federal labor union representing 150,000 workers across about three dozen U.S. agencies, is suing to block the Trump administration from trying to end collective bargaining with government employees.

The National Treasury Employees Union filed suit Monday to block U.S. President Donald Trump's executive order last week that stripped collective bargaining rights from hundreds of thousands of federal workers.

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 and threatens the union's very existence.