Around 138 million people voted in the 2016 election, but 306 people officially elected the president by using their electoral college votes. Here’s why the Electoral College exists.

The Supreme Court will decide whether Electoral College voters have a constitutional right to cast ballots for candidates who didn’t win their state’s popular vote, the justices announced in an order on Friday.

The justices said they will hear two cases brought by Electoral College voters in Washington state and Colorado who refused to vote for Hillary Clinton in 2016 despite her wins in those states.

Like most states, Washington and Colorado require their electors to follow the will of their states’ voters. But those laws are now being challenged by Electoral College voters who argue that such laws are unconstitutional.

A decision in the matter is expected by the end of June, ahead of the U.S. presidential election in November. The cases are the latest in a string of high-profile disputes the