Barack Obama, during his final days in the White House, received a letter from the alleged architect of the 9/11 terrorist attacks on New York City, but the details of what exactly he had to say to the president were not revealed to the public.

Until now.

In an 18-page letter cited in the Miami Herald, Khalid Sheikh Mohammed, who is on trial for his life at Guantanamo Bay, addressed Obama as “the head of the snake” and blamed America for policies that led to the death of innocents around the world.