The fight at the border is getting worst.

The federal government’s sent a letter this week to the state of Arizona demanding the removal of the double-stacked shipping containers that have been put in place to help fill the gaps in the wall along the U.S.-Mexico border. Federal government officials say the containers are unauthorized and violate U.S. law.

The Bureau of Reclamation’s letter called for the containers near the desert city of Yuma to be removed and no additional new ones should be put in their place. The letter says the bureau’s actions is to prevent conflicts with two federal contracts already awarded and two more pending to fill two border wall gaps near the Morelos Dam in the Yuma area.

“The unauthorized placement of those containers constitutes a violation of federal law and is a trespass against the United States,” the letter states. “That trespass is harming federal lands and resources and impeding Reclamation’s ability to perform its mission.”

There has been no immediate from Republican Gov. Doug Ducey’s office. Ducey’s office originally announced that they would remove the containers if the U.S. government takes action and begins construction to fill the gaps.

The Cocopah Indian Tribe is welcoming the action from the federal government. The tribe complained last month that the state of Arizona acted against its wishes by placing 42 of the double stacks on their land near Yuma. The effort from the state had intentions to halt heavy illegal border crossings in an area that has become a major entry point for migrants.

“We believe the Bureau is taking the necessary and appropriate action to resolve this issue,” the Cocopah tribe said in a statement distributed Monday. “Beyond that, we will continue working side-by-side with local, state and federal law enforcement on securing the border.”

On President Joe Biden’s first day in office he stopped the wall construction, leaving billions of dollars of work uncompleted, however still under contract.

Earlier this year, Ducey announced he couldn’t wait for the U.S. Customs and Border Protection to award the contracts and proceeded with plans to fill the gaps in the border wall at the border. He ordered the installation of more than 100 double-stacked containers that were placed over the summer.

There have been reports that migrants have avoided the new established barriers and have been going around them which include a path through the Cocopah Indian Reservation.