Nobody but the vice-president can hold the job of the presidency temporarly. The Speaker of the House would be sworn in as President if the presidency and vice-presidency were vacated at the same time. He would then nominate a new vice-president.
if there is no president or vice president, i think the chairman of the house of representatives serves temporarily
John Tyler.
nope
the vice president
Richard Nixon appointed Gerald Ford to the VP position after Spiro Agnew resigned. This was the first VP vacancy that occurred after the ratification of the 25th amendment which gave the president the power to appoint a new VP if the office became vacant.
Following the death in office of President William Henry Harrison, there was a vacancy in the office of Vice-President until March 4, 1845.
The 25th amendment specifies that the President may appoint a Vice President to fill a vacancy in that office, subject to the approval of both houses of Congress.
Order of succession.
Presidential Line of Succession
In the event, the president picks a new vice president who then must be approved by both houses of Congress before he can take office.
The Vice president became the president.
Whenever there is a vacancy in the office of the Vice President, the President shall nominate a Vice President who shall take office upon confirmation by a majority vote of both Houses of Congress.