The SC has rarely, if ever , denied power to DC.
Its hard to bite the hand that not only feeds you but picked you for the job. The very idea that the Federal Employees in black robes could or would uphold their own Constitutional(limited) Government is laughable to say the least.
They were not hand picked by impartial parties, they were not ratified by impartial parties, their position as arbitrars of federal law does not render them any self-interest in limited federal power.
Essentially what those who claim the Federal court is the only one who can enforce the Federal Constitution are depending upon is a fantastic level of magnanimity that has only rarely been displayed.