If both the President and the Vice President can no longer serve, who becomes the President?

The Speaker of the House becomes the President if both the President and the Vice President can no longer serve. This is established by the Presidential Succession Act and is outlined in the U.S. Constitution. The Speaker is elected by the members of the House of Representatives and is next in line after the Vice President in the order of succession to the presidency. This ensures a clear line of leadership and continuity of government in the event of vacancies at the highest levels of executive leadership.

The other positions listed, including the Secretary of State, the Chief Justice, and the President Pro Tempore of the Senate, do not have this role in the presidential succession order. The Secretary of State is primarily responsible for foreign affairs, the Chief Justice leads the Supreme Court, and the President Pro Tempore is a largely ceremonial role within the Senate hierarchy. Their responsibilities and jurisdictions are distinct from the executive branch's leadership, which is why they do not succeed the presidency under these circumstances.