Despite the red-hot political undertones in the U.S. Justice Department’s lawsuit against Texas Gov. Greg Abbott over the buoy barrier installed in the Rio Grande, the federal judge presiding over the case made clear that any political considerations will get short shrift in his courtroom.

“This is a United States district court. It’s not Congress. It’s not the president,” Senior U.S. Judge David Alan Ezra told the lawyers for both sides Tuesday during the first hearing in advance of a coming trial. “I am not here to engage in any type … of political comment in this decision.”

The decision before the 35-year veteran of the federal bench is whether the string of buoys floating as a border barrier in the international river near Eagle Pass should be removed pending the outcome of the case.

Testimony from three expert witnesses rested on whether Abbott needed approval from the U.S. Army Corps of Engineers before placing the 1,000 feet of giant orange balls that are tethered to 68 concrete blocks weighing 3,000 pounds apiece.

Abbott and lawyers for the state of Texas have insisted the governor acted under his legal authority to protect the state from an “invasion” caused by unlawful immigration and drug trafficking.

But the Justice Department, both in court documents and during witness questioning Tuesday, said that, under the Rivers and Harbors Act of 1899, the Corps of Engineers must sign off on structures placed in any navigable U.S. waters.

Patrick K. Sweeten, Abbott’s general counsel, parried with Joseph Shelnutt of the Corps of Engineers over whether the section of the Rio Grande that flows between Eagle Pass and Piedras Negras, Coahuila, is actually navigable.