If no candidate receives a majority of electoral votes, the Presidential election leaves the Electoral College process and moves to Congress. The contingency procedure in the 12th Amendment of the US Constitution outlines the process for electing the President and Vice President if no candidate receives a majority of the electoral votes. Here are the steps:

1. The House of Representatives must go into session immediately to choose a president from among the three candidates who received the most electoral votes.
2. Each state delegation votes en bloc, with each having a single vote.
3. A candidate must receive an absolute majority of state delegation votes (currently 26 votes) to become president-elect.
4. The House continues balloting until it elects a president.

If the House of Representatives is unable to elect a President by Inauguration Day, the Vice President-elect becomes President according to §3 of the 20th Amendment.