The Presidio Municipal Development District argued in federal court Tuesday that the Trump administration’s plan to build a border wall through a levee system protecting the community could cause flooding and that the administration is not following the law as it rushes construction forward.

The hearing came as the Department of Homeland Security pushes forward with its $46 billion plan to complete the border wall from the Pacific Ocean to the Gulf of Mexico. The department is central to the Trump administration’s broader immigration enforcement plans, and the lawsuit pits a town of a little over 3,200 residents in rural Texas against a key piece of that agenda.

The Presidio development district contends that placing a barrier through the levee that shields the community would create a flooding hazard. The town also argues that federal officials are failing to comply with legal requirements as they move quickly on the project.

The suit is part of a widening set of challenges to the border wall. According to the Associated Press, the department is running into opposition from landowners, environmental groups, and Native American tribes who argue that rapid construction threatens historical sites, religious sites, and a long-standing way of life along the border. Those challenges are unfolding even as crossings from Mexico are at extreme lows, the wire service reported.

The Presidio case also highlights a tension that has long resonated with many Americans, in particular Republicans: the friction that sometimes arises between the most local of municipalities and the federal government. That dynamic is on full display as the DHS presses ahead with a project that the president has described as a signature promise, while a small West Texas town asks the court to slow it down.