Our founding fathers created a constitutional system of checks and balances to prevent tyranny. They accomplished this by creating three separate branches of government: the executive branch, the legislative branch, and the judicial branch. In order to ensure that no one person or group of persons becomes too powerful, each branch can limit the powers of the other two branches and is itself limited in what it can and cannot do. It is a brilliant system that has generally functioned well for over 200 years.
An independent judiciary is vital to our constitutional system of checks and balances. Individual judges and the judiciary as a whole must be free to evaluate cases and render opinions impartially and in accordance with the law, without political interference or other external pressures. Otherwise, those in power would be able to tip the scales of justice toward themselves based on their own passions and prejudices.
Judicial independence protects our essential freedoms. And it is the courts -- not the president or the legislature -- that decide what is constitutional and what is not constitutional.
Trump's recent statements about U.S. District Judge James Robart, the federal judge who issued a temporary restraining order blocking his immigration order, demonstrate powerful ignorance of the law and a lack of respect for our constitutional system of checks and balances.