<P> The United States Constitution assigns few powers or duties to the vice president . The Vice President 's primary function is to succeed to the presidency if the President dies , resigns , or is impeached and removed from office . Nine vice presidents have ascended to the presidency in this way : eight ( John Tyler , Millard Fillmore , Andrew Johnson , Chester A. Arthur , Theodore Roosevelt , Calvin Coolidge , Harry S. Truman and Lyndon B. Johnson ) through the president 's death , and one ( Gerald Ford ) through the president 's resignation . In addition , the Vice President serves as the President of the Senate and may choose to cast a tie - breaking vote on decisions made by the Senate . Vice presidents have exercised this latter power to varying extents over the years . </P>
<P> The United States Constitution assigns few powers or duties to the vice president . The Vice President 's primary function is to succeed to the presidency if the President dies , resigns , or is impeached and removed from office . Nine vice presidents have ascended to the presidency in this way : eight ( John Tyler , Millard Fillmore , Andrew Johnson , Chester A. Arthur , Theodore Roosevelt , Calvin Coolidge , Harry S. Truman and Lyndon B. Johnson ) through the president 's death , and one ( Gerald Ford ) through the president 's resignation . In addition , the Vice President serves as the President of the Senate and may choose to cast a tie - breaking vote on decisions made by the Senate . Vice presidents have exercised this latter power to varying extents over the years . </P>
who was a vice president that became president
who was a vice president that became president
John Tyler
John Tyler