Eleven Secret Service employees are accused of bringing prostitutes back to their hotel in Cartagena ahead of President Obama's visit for a summit in Colombia. The agents and officers have been placed on leave while the agency investigates their conduct. Although prostitution is legal in parts of Colombia and no law was broken, if the reports are true, the employees still violated rules of conduct. Tim Weiner, author of "Enemies: A History of the FBI," has won the Pulitzer Prize and the National Book Award for his work on national security. Weiner explains what happened and why the employees' alleged indiscretions could have put the President Obama's life at risk.