JFK got done in because Lyndon Johnson was a much more palatable president. If the vice president is not on their side, they'd have to keep killing people down

JFK got done in because Lyndon Johnson was a much more palatable president. If the vice president is not on their side, they'd have to keep killing people down the line of succession until they got to somebody who was. After the vice president: Speaker of the House (currently Paul Ryan) > President pro tempore of the Senate (currently Orrin Hatch) > long line of officials serving at the pleasure of the president.