Actually I do not prevent the president from doing anything, but placing judges under his control is not something a president can readily do. Federal judges are appointed for life just to keep them immune from political pressure. They surely do not answer to the president.
The President has the power to appoint federal judges for life, and Congress confirms or denies the appointments. The federal courts' most important power is that of judicial review, the authority to interpret the Constitution.
federal judges
for life
cause its fun to power judges
Over the Federalist Judges
life
Buffers are important because they control the PH or "acidic" balance.
Over the Federalist Judges
federal
Life.
LIFE!