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.

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’s lawsuit is the first to challenge the president’s ouster of several members of independent boards — moves that appear to contravene a 1935 Supreme Court ruling.