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.

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.

(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.

Attorneys for Amazon and Elon Musk's SpaceX have argued in a federal appeals court that the National Labor Relations Board's structure is unconstitutional.

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.

The SpaceX lawsuit was filed against the NLRB in January after the agency accused the company of unlawfully firing eight employees who had cosigned an open letter in which they criticized Musk and had accused the company of creating the impression of surveillance at the company.

Amazon and SpaceX face dismissal of NLRB challenges as judges question premature appeals over alleged labor law violations.

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.

Elon Musk’s SpaceX and Attorneys for Amazon have argued in a federal appeals court that the National Labor Relations Board’s structure is unconstitutional