Texas must move a floating barrier on the Rio Grande that drew backlash from Mexico, a federal appeals court ruled Friday, dealing a blow to one of Republican Gov. Greg Abbott's aggressive measures aimed at stopping migrants from entering the U.S. illegally.

The decision by the 5th U.S. Circuit Court of Appeals requires Texas to stop any work on the roughly 1,000-foot barrier and move it to the riverbank. The order sided with a lower court decision in September that Abbott called "incorrect" and had predicted would be overturned.

Instead, the New Orleans-based court handed Texas its second legal defeat this week over its border operations. On Wednesday, a federal judge allowed U.S. Border Patrol agents to continue cutting razor wire the state installed along the riverbank, despite the protests of Texas officials.

For months, Texas has asserted that parts of the Rio Grande are not subject to federal laws protecting navigable waters. But the judges said the lower court correctly sided with the Biden administration.

"It considered the threat to navigation and federal government operations on the Rio Grande, as well as the potential threat to human life the floating barrier created," Judge Dana Douglas wrote in the opinion.

Abbott called the decision "clearly wrong" in a statement on social media, and said the state would immediately seek a rehearing from the court.

"We'll go to SCOTUS if needed to protect Texas from Biden's open borders," Abbott posted.

The Biden administration sued Abbott over the linked and anchored buoys — which stretch roughly the length of three soccer fields — after the state installed the barrier along the international border with Mexico. The buoys are between the Texas border city of Eagle Pass and Piedras Negras, Coahuila.

Thousands of people were crossing into the U.S. illegally through the area when the barrier was installed. The lower district court ordered the state to move the barriers in September, but Texas' appeal temporarily delayed that order from taking effect.

The Biden administration sued under what is known as the Rivers and Harbors Act, a law that protects navigable waters.

In a dissent, Judge Don Willet, an appointee of former President Donald Trump and a former Texas Supreme Court justice, said the order to move the barriers won't dissolve any tensions that the Biden administration said have been ramping up between the U.S. and Mexico governments.

"If the district court credited the United States' allegations of harm, then it should have ordered the barrier to be not just moved but removed," Willet wrote. "Only complete removal would eliminate the "construction and presence" of the barrier and meet Mexico's demands."

Nearly 400,000 people tried to enter the U.S. through the section of the southwest border that includes Eagle Pass last fiscal year.

In the lower court's decision, U.S. District Judge David Ezra cast doubt on Texas' rationale for the barrier. He wrote at the time that the state produced no "credible evidence that the buoy barrier as installed has significantly curtailed illegal immigration."

Officials with U.S. Customs and Border Protection did not immediately comment.

In:
• Texas
• Rio Grande
• Migrants