If no presidential candidate gets 270 electoral votes, the House of Representatives decides who will be the next president.
This has happened in the US before, during the election of 1824. In this race, John Quincy Adams, Andrew Jackson, and Henry Clay ran for president. None of them got enough electoral college votes to become president. Even though Andrew Jackson got the most electoral college votes out of all the nominees, the House of Representatives picked John Quincy Adams to become America's next president.
