Station Casinos on Tuesday filed a constitutional challenge to National Labor Relations Board proceedings, seeking a way to stop several union-busting allegations in litigation by alleging the federal agency lacks the authority to prosecute claims against businesses like them.

The locals casino operator filed a lawsuit against the administrative agency and its leaders in the U.S. District Court in Nevada, records show. The company seeks a temporary and permanent injunction to halt pending proceedings in the nation’s top labor relations court.