With the creation of a special congressional committee to investigate the 2012 attack on the U.S. consulate in Benghazi, the three branches of government will soon head for a constitutional collision. Obama administration officials, past and present, will resist the call to testify. They will respond to congressional subpoenas by claiming executive privilege or asserting their right to avoid self-incrimination. To get answers to its questions, the committee may hold Obama officials in contempt. Under today’s misconceived system of judicial supremacy, the courts may decide the winner. If the original understanding of the Constitution prevailed, Congress would probably prevail. But investigations has become yet another matter where Washington, D.C.’s practices have strayed far from the Constitution.