The U.S. Supreme Court has decided on a case that may impact November's presidential vote.

On Monday, The court decided that states can punish members of the Electoral College who break a pledge to vote for a state's popular vote winner in presidential elections.

The ruling was unanimous, 9-0.

So what’s the Electoral College?

Voters who go to the polls on election day actually do not choose the president directly.

Technically they are voting for the electors who meet in their respective states and vote for president and vice president.

The president and vice president who win the popular vote in any given state receive all of the state's Electoral College votes.

In the end, the winner is the candidate who gets a majority of the electoral votes.

But in 2016, some members of the Electoral College broke their pledges and voted for someone other than the candidate who won the popular vote in their state.

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