A panel of U.S. judges on Monday seemed likely to rule that Amazon.com and Elon Musk's SpaceX were too quick to bring their challenges to the National Labor Relations Board's structure to an appeals court.

Big Tech's big war on American labor watchdog stumbles... bigly Amazon and SpaceX argued in court today that the US National Labor Relations Board (NLRB) is an unconstitutional body – but a three-judge panel didn't seem particularly enamored of their arguments.

(NASDAQ:AMZN) and Elon Musk’s SpaceX may encounter obstacles in their attempts to block the National Labor Relations Board or NLRB cases. What Happened: On Monday, a panel of U.S. judges suggested that both companies might have prematurely brought their challenges to the NLRB’s structure to the 5th U.

Amazon and SpaceX are just among the rising number of companies that have opted to challenge the labor agency's structure. Lawsuits against the NLRB have been filed around the country, stating that a number of the processes violated U.S. Constitution. The case of Amazon and SpaceX are just among those that already reached the appellate court.

The oral arguments represented the latest legal attack from corporations against the 89-year-old National Labor Relations Board, buoyed by the U.S. Supreme Court's ruling this year in SEC v. Jarkesy.

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.

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.