Calling Mandela an inspiration, Obama said he has demonstrated what can happen when “righteous people, people of good will work together for a larger cause.”

Obama, who is currently in Senegal, is set to travel to South Africa on Friday, where he will spend several days.

Mandela's daughter Makaziwe said in a radio interview with SABC on Thursday that her father's condition “doesn't look good.”

Still, she added, “He's still there. He might be waning off, but he's still there.”