There is now credible evidence that President Trump pressed FBI Director James Comey to end the investigation of Michael Flynn, the administration's first national security adviser. If true, Trump could be guilty of obstruction of justice. But there is no mechanism in place to ensure a truly independent inquiry of this or other possibly illegal actions by high level Trump officials. Congress should therefore renew the independent counsel statute providing for the appointment of a special prosecutor, one who cannot be fired by the president or the attorney general. Gen. Rod Rosenstein announced he was appointing former FBI Director Robert S. Mueller III as independent special prosecutor to take over the Justice Department investigation of Russian meddling in the 2016 election.