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).