Amazon and SpaceX are seeking to hamstring the National Labor Relations Board, asking a court to declare its processes for upholding labor law unconstitutional. But judges on a three-person panel appeared skeptical when the companies presented their arguments Monday.

Attorneys for Amazon and Elon Musk’s SpaceX argued in a federal appeals court Monday that the National Labor Relations Board’s structure is unconstitutional, advancing a legal fight that may last into the Trump administration where Musk is expected to oversee bureaucratic cost-cutting.

SpaceX and Amazon are asking the Fifth Circuit Court of Appeals to find the National Labor Relations Board unconstitutional. The federal agency is tasked with enforcing workers' right to organize.