The largest federal government employee union is alleging in a new lawsuit that the Trump administration violated its First Amendment rights and the "hallowed" sanctity of contracts by canceling a collective bargaining agreement covering Transportation Security Administration (TSA) airport security screeners.

The largest federal employee union filed a lawsuit on Thursday seeking to block President Donald Trump's administration from ending collective bargaining for nearly 50,000 Transportation Security Administration officers that staff checkpoints at U.

The announcement comes a week after the US Department of Homeland Security (DHS) terminated the collective bargaining agreement.

The Trump administration says the move will improve the passenger experience, but union officials fear it will harm morale and hurt recruiting efforts.

A coalition of labor unions has filed a lawsuit against the Trump administration, seeking to stop the Department of Homeland Security from terminating a negotiated TSA union contract.

The American Federation of Government Employees accused the Trump administration of retaliating against the labor group over their efforts to block the mass firing of probationary workers across government.

A union representing Transportation Security Administration workers calls the Department of Homeland Security's decision to end the agreement an 'unprovoked attack.'