 Former U.S. President Barack Obama says Archbishop Desmond Tutu was a mentor, a friend, and a moral compass for him. Tutu, a veteran of the struggle against white minority rule, died on Sunday, age 90. Reacting to his death, Obama said the peace prize laureate was a universal spirit. Also, British Prime Minister Boris Johnson described him as a critical figure in the fight against apartheid and in the struggle to create a new South Africa.