A federal judge on Wednesday ruled that President Donald Trump lacked the authority to remove a Democratic member from the Federal Labor Relations Authority, ordering that Susan Tsui Grundmann be reinstated to her post.

The U.S. agency that enforces the labor rights of private-sector workers is abandoning its defense of a law barring the president from removing appointees at will, as President Donald Trump seeks to oust a Democratic member.

President Donald Trump’s firing of the former chairwoman of the National Labor Relations Board was an “illegal act,” a federal judge ruled Thursday, overturning her ousting in a decision that was highly critical of Trump’s “intent on pushing the bounds of his office.