The August summit seeks to build on Obama's trip to Africa last year to strengthen trade and...
"Can imagine what Nelson Mandela would say," Leahy tweeted.
The president compared the late anti-apartheid icon to Gandhi and Lincoln in his remarks.
Obama is expected deliver remarks about Mandela’s legacy at some point during the trip.
President Obama and first lady Michelle Obama will be in South Africa Tuesday.
The president thanked her for Mandela's profound influence on the world.
John Earnest said the controversies were "far less important" than Mandela's legacy.
The president appeared to pose for a photo with Danish, British leaders.
Obama will also try to meet with the Mandela family and South Africa's president.
Baker said he was "amazed" at Mandela's soft spokenness and conviction.
Nelson Mandela’s family released their first statement since his death.