George w bush

Former US presidents Bill Clinton (L), George W. Bush (C) and Clinton's daughter Chelsea Clinton (R) attend the official memorial ceremony for late South African president Nelson Mandela at FNB Stadium in Johannesburg, South Africa, 10 December 2013. Nobel Peace Prize winner Nelson Mandela died on 05 December at the age of 95.

Dai Kurokawa/EPA

Former US presidents Bill Clinton, George W. Bush and Mr Clinton’s daughter Chelsea Clinton attend the official memorial ceremony for Nelson Mandela

Part of the World Trade Center stands inside the library as part of the tour that the public will be able to see on the day the George W. Bush Presidential Library opens for the first time to the public on the campus of Southern Methodist University in Dallas, Texas

Larry W Smith/EPA

Part of the World Trade Center stands inside the library as part of the tour that the public are able to see on the day the George W. Bush Presidential Library opens for the first time to the public on the campus of Southern Methodist University in Dallas, Texas.