In 1868, Ulysses S. Grant faced his greatest challenge since the end of the Civil War when President Andrew Johnson appointed him Acting Secretary of War. How did Johnson's actions put Grant squarely in the middle of a Constitutional crisis? Colleen talks with General Stanley A. McChrystal (ret.) about Grant's sense of duty, his commitment to the rule of law, and the controversy that led to the first presidential impeachment in American history.
