Former National Labor Relations Board member Gwynne Wilcox speaks to CNN’s Victor Blackwell after being fired by President Donald Trump, making her the first member of the board to be removed in 90 years.

The NLRB has come under fire from companies including Amazon and Elon Musk's SpaceX, who have argued that the labor board's structure is unconstitutional.

WASHINGTON—A member of the National Labor Relations Board fired by President Trump sued him Wednesday, setting up a high-stakes battle over whether federal law limiting the president’s power to remove top executive-branch officials is constitutional.

Gwynne Wilcox, a Democratic member of the National Labor Relations Board (NLRB) fired by President Trump, sued him Wednesday over the ouster. Wilcox’s attorneys claim Trump’s firing was a “blatant violation” of NLRB members’ removal protections contained within the National Labor Relations Act (NLRA).

Gwynne Wilcox alleged that President Trump exceeded his authority and broke with nine decades of precedent in ousting her from the agency that oversees unions and workers’ rights.

This extraordinary act, which was not only contrary to statute but clearly unlawful under a 90-year-old Supreme Court precedent.

Gwynne Wilcox filed a lawsuit Wednesday, accusing President Donald Trump of breaking the law when he fired her last week. Wilcox claims the