What happens if no prential candidates wins a mojority of electoral votes?

If no presidential candidate wins a majority of the electoral votes (at least 270 out of 538), the election is decided by the House of Representatives. Each state delegation casts one vote for one of the top three candidates, and a majority of state delegations (26) is required to win. Meanwhile, the Senate elects the vice president from the top two vice-presidential candidates. This process is outlined in the 12th Amendment of the U.S. Constitution.