President Donald Trump fired FBI Director James Comey while being investigated for possible collusion with Russia to meddle in the 2016 presidential election. This set in motion a chain of events that could lead to the biggest constitutional crisis in U.S. history. The meetings and calls between the President and Comey, and the escalating Russia investigation, reveal how the pillars of democracy are being tested. Comey's firing triggers the appointment of Special Counsel Robert Mueller, who must now carry the torch of justice.