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