The U.S. Supreme Court on Thursday will consider whether former President Donald Trump’s role in the Jan. 6, 2021, attack on the U.S. Capitol disqualifies him from the presidency.

The historic case could have huge consequences for this year’s election if the justices decide that Trump, the front-runner for the GOP nomination, is barred by the Constitution from returning to the White House.

It’s the biggest presidential election case since the Supreme Court decided Bush v. Gore in 2000, effectively confirming the election of George W. Bush.