Just a year after Nayib Bukele took office as President of El Salvador, killings in what used to be the "murder capital of the world" have dropped a whopping 60 percent. Should Bukele take full credit, or are there other factors at play?
President Trump fired him after just 3 months. Now, former U.S. attorney Preet Bharara -- a man who oversaw investigations into suspected Russian organized crime -- offers his take on the Mueller investigation.