Months into his second term, President Donald Trump welcomed Saudi Crown Prince Mohammed bin Salman to the White House. It had been seven years since a Saudi hit squad murdered journalist Jamal Khashoggi, in an operation U.S. intelligence assessed MBS had approved.Now, Trump hailed MBS as a friend. The two men announced from the Oval Office that Saudi Arabia planned to invest hundreds of billions of dollars in the U.S.FRONTLINE's new documentary "The Crown Prince & the President" draws on over 100 interviews to investigate what forces bind the two men and their countries together, and what each stands to gain.