Other top trending names were Obama, Kathleen Sebelius, Ted Cruz and Dianne Feinstein.
Bush's first tweet on Tuesday was about Nelson Mandela.
Rubio says Obama should have asked Castro about basic freedoms in Cuba.
Obama and Cuban President Raul Castro shook hands at Mandela's memorial service.
Johannesburg expects event to be “among the biggest gatherings of world leaders."
President Obama is traveling to South Africa on Monday ahead of the memorial service for anti-...
President Obama and Michelle Obama will be in South Africa next week to honor Mandela.
The president said the South African leader set an example “all humanity should aspire to.”
Attorney General Eric Holder should complete a full report about the conduct that would legally be...
The president’s handshake with Cuban President Raúl Castro provoked disapproval from GOP.
McCain later said he was joking, although the gesture "was terrible."
President Obama shared a brief handshake with Cuban President Raul Castro at the Nelson Mandela...
President Obama at a memorial on Tuesday in South Africa called the late Nelson Mandela "the last...
Obama is missing the annual event to attend services for Nelson Mandela.
Speaker John Boehner has tapped the Illinois Republican to lead the House delegation.
OPINION | I propose we mourn the passing of Nelson Mandela with challenges for bold action.
Nelson Mandela, the anti-apartheid revolutionary who became the first black South African president...