If the high court sides with Starbucks, it could make it tougher for the agency to step in when it alleges corporate interference in unionization efforts.
There are bipartisan calls to hit the breaks as defense spending nears $1 trillion. Others say that amount is not enough to fund U.S. strategy worldwide.
A regional director for the National Labor Relations Board filed a complaint that consolidates eight unfair labor practice charges against Musk's SpaceX.