If the president dies, resigns, or is removed from office, the vice president automatically becomes president. Likewise, were a president-elect to die during the transition period, or decline to serve, the vice president-elect would become president on Inauguration Day. A vice president can also become the acting president if the president becomes incapacitated. However, should the presidency and vice presidency both become vacant, the statutory successor called upon would not become president, but would only be acting as president. To date, two vice presidents—George H. W. Bush (once) and Dick Cheney (twice)—have served as acting president. No one lower in the presidential line of succession has so acted.