The order suggests justices will soon eliminate congressional power to insulate agencies from political interference.

An appeals court previously ruled that a key 1935 precedent, long in the cross hairs of the conservative legal movement, meant the officials could keep their jobs.

A U.S. Supreme Court May 22 ruling in a legal battle over President Donald Trump's firing of two federal labor board members contained a line that eased, for now, worries that the cases could open the door for Trump to fire Federal Reserve Chair Jerome Powell at will.