Just a bit of information. Hopefully JFK used it in his last days.
The Independent: A few seconds after 12:30pm on 22 November 1963, Lyndon B Johnson lay face down on the floor of his limousine under a secret service agent called Rufus Youngblood. Radios crackled with panic and confusion. Neither man knew it yet but the moment a bullet had killed JFK two cars ahead, Johnson had automatically become President of the United States.
The US constitution requires that a new President must swear an oath of office before executing it, customarily it is done while laying his hand on a Bible held by a senior judge, and saying: “I do solemnly swear (or affirm) that I will faithfully execute the Office of President of the United States, and will to the best of my ability preserve, protect and defend the Constitution of the United States”. More on this here.
