That scenario has happened exactly four times as of 2017, with Theodore Roosevelt, Calvin Coolidge, Harry Truman, and Lyndon Johnson.
John Tyler was the first vice-president to become president because the elected president died in office. He succeeded William Henry Harrison who died in office in April 4, 1841.
No person who is not elligible to be President can become Vice-President. No person may be elected more than twice to the office of President. There is disagreement as to whether this prevents a former President from serving as a Vice-President, since he would not have been elected to the office of President should he succeed to that office due to the death or disability of the President. But he clearly would be prevented from running for election after filling out the remainder of the term of a President who died in office.
"If the President is convicted in an impeachment trial" (or dies), "the President is the only person who loses his office. The Vice President would become the President upon the conviction." -US Constitution
Because he wanted to
The speaker of the house is very important. He/she becomes president of the US in the event the President and vice president become unable to hold their office.
Presidents serve one term before they must be reelected.
Ronald Reagan was 69 when first elected President in 1980; he was 73 when elected to his second term of office.
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22nd & 24th President Grover Cleveland
Succeeded Kennedy for two years Reelected for fourThe 35th President of the United States was John F. Kennedy. President Kennedy was in office from January 20, 1961 until November 22, 1963 when he was assassinated. Lyndon B. Johnson was the vice President and succeeded Kennedy to become the 36th President of the United States. President Johnson finished the two years left in Kennedy's term, and was reelected into office 1964, and served as President for 6 years from November 22, 1963 to January 20, 1969.
four years, if reelected, eight.
George W. Bush (43rd President) was born July 6, 1946. He was 58 when he was reelected in 2004, and 62 when he left office in 2009.
Grant was elected a second time in November of 1872.
Panama's president is Ricardo Martinelli. He took office in July and will serve for five years. He cannot be reelected.
President Coolidge was reelected in 1924The 30th President of the United States was Calvin Coolidge. President Coolidge was in office from August 2, 1923 to March 4, 1929. In 1923 Coolidge the Vice President at the time succeeded President Warren G. Harding who died in office. Coolidge finished the term from 1923 to 1925. President Coolidge was reelected in 1924 and served his second term from 1925 to 1929.
The Vice-President rarely becomes President, and then it is usually because the previous President died while in office.
Because he decided to run for office and won the elections.