The family of former South African President Nelson Mandela says his condition remains critical but stable. Mandela’s daughter says he is responding to touch but is also warning that “anything is imminent.” President Obama arrives in South Africa today to continue his three-nation African tour. Speaking on Thursday, Obama paid tribute to Mandela’s legacy.

President Obama: “I’ve had the privilege of meeting Madiba and speaking to him. And he is a personal hero, but I don’t think I’m unique in that regard; I think he’s a hero for the world. And if and when he passes from this place, one thing I think we’ll all know is that his legacy is one that will linger on throughout the ages.”