The Speaker of the House would never become President Pro Tempore, as that is an office within the Senate.
THis is not correct. The Speaker of the House is before the pro tempore of the Senate. This is all part of the presidential succession act of 1947 s codified at 3 U.S.C, § 19.
If the President of the United States is removed from office, the Vice President immediately becomes the new President. Then, the Speaker of the House of Representatives becomes the President if the Vice President is unable to assume the role. The President Pro Tempore of the Senate would be next in line if both the Vice President and the Speaker of the House are unable to take on the presidency.
In the short term, the President pro tempore of the Senate and the other members of the President's Cabinet. But under the terms of the 25th Amendment, the President will nominate a new Vice President, to be confirmed by the Senate. There is no succession to the office of the Vice President.
The President Pro Tempore of the U.S. Senate is third in line to become President of the United States. The current President, the Vice President, and the Speaker of the House of Representatives would have to die or become otherwise incapacitated before the President Pro Tempore would become the U.S. president. Currently the office of President Pro Tempore is held by Senator Daniel Inouye of Hawaii. He was sworn in on June 28, 2010 following the death of Robert Byrd.
Such was the law passed by Congress and in effect for many years. It was the law when Andrew Johnson was tried for impeachment. The president pro tempore, who would have become President ,if Johnson had been convicted, voted guilty despite the obvious conflict of interest. This conflict of interest is one of the reasons the law was changed to put the Speaker of the House before the pro temp in the revised order of succession.
The President pro tempore of the Senate is the next in line of succession after the Speaker of the House of Representatives.
Passed in 1947, this is an act of Congress that provides for a clear definition of who will assume the office if the president and vice-president are killed at the same time . The presidency would pass to first eligible person in the succession list which house speaker, president-pro-tempore of the Senate, and then the cabinet members in the order which their department was created.
If the President and Vice-President are not able to fulfill their duties, the Speaker of the House (currently R-OH John Boehner) would assume the presidency. After that the President Pro Tempore of the Senate (currently D-HI Daniel Inouye) would assume the presidency. The 5th in line to the presidency is the Secretary of State (currently D-NY Hillary Clinton).
If the vice-president had to assume the office, he would be sworn in as President of the United States and would be called "Mr. President" from that time on.
If you are asking about the Presidential succession list, The Secretary of State is next in line after the President pro tempore. If the president pro tempore dies or resigns his office , a new pro tempore would be elected by the Senate. If a senator is too sick to serve but does not resign, nothing is done.
Senator Benjamin F. Wade is the answer. He was president pro tempore of the Senate. In those days, the President Pro Tempore of the Senate was next in line for president after the vice-president. Since there was no vice-president at this time , he was next in line after Johnson. He voted to convict Johnson and people noticed that there was a conflict of interest in the succession law- now the Speaker of the House is ahead of the president pro tempore and the conflict is removed.