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 claims 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.

President Donald Trump took his most consequential action against federal employee unions yet late Thursday, signing an executive order aimed at ending collective bargaining for government employees whose work include national security aspects.