SCOTUS can't prevent POTUS from enforcing existing law and removing illegals from the interior like Eisenhower did.
Neither can SCOTUS stop Trump from declaring an emergency and militarizing the border.
The 9th Circuit can and will. They tied up the “travel ban” remember.
Anything trump does with executive power on immigration will get stopped by a 9th circuit judge for a minimum of 1 to 2 years before it reaches the supreme court. Period.