Science Advisor to the President War II by President Franklin Delano Roosevelt. Vannevar Bush chaired this office through Roosevelt's death in 1945, and continued under Roosevelt's successor Harry S. Truman until 1951. After the war, President Harry S. Truman replaced the OSRD with the Science Advisory Committee in 1951. The office was moved to the White House on November 21, 1957, by President Dwight D. Eisenhower to provide advice and recommendation in response to the Space Race started by the USSR's launch of the first artificial Earth satellite, Sputnik 1. President Richard M. Nixon eliminated the PSAC in 1973, rather than appointing a replacement for
President of France to. He was succeeded by Nicolas Sarkozy on 16 May 2007. Following a further change, the constitutional law on the modernisation of the institutions of the Fifth Republic, 2008, a President cannot serve more than two consecutive terms. François Mitterrand and Jacques Chirac are the only Presidents to date who have served a full two terms (14 years for the former, 12 years for the latter). In order to be admitted as an official candidate, potential candidates must receive signed nominations (informally known as "parrainages", for "sponsors") from more than 500 elected officials, mostly mayors. These officials must be from