SECTION 8. In case of death, permanent disability, removal from office, or resignation of the President, the Vice-President shall become the President to serve the unexpired term. In case of death, permanent disability, removal from office, or resignation of both the President and Vice-President, the President of the Senate or, in case of his inability, the Speaker of the House of Representatives, shall then act as President until the President or Vice-President shall have been elected and qualified.