President Donald Trump’s and Democratic rival Joe Biden’s campaigns are assembling armies of powerful lawyers for the possibility that the race for the White House is decided not at the ballot box but in court.

They have been engaging in a lawyer’s version of tabletop war games, churning out draft pleadings, briefs and memos to cover scenarios that read like the stuff of a law school hypothetical more than a real-life case in a democracy.

Attorneys for the Republicans and the Democrats are already clashing in courts across the U.S. over mailed-in ballot deadlines and other issues brought on by the coronavirus pandemic. And as Trump tries to sow doubt in the legitimacy of the Nov. 3 election, both sides have built massive legal operations readying for a bitterly disputed race that lands at the Supreme Court.

“We’ve been preparing for this for well over a year,” Republican National Committee Chief Counsel Justin Riemer told The Associated Press. “We’ve been working with the campaign on our strategy for recount preparation, for Election Day operations and our litigation strategy.”

On the Democratic side, the Biden campaign’s election protection program includes a special national litigation team involving hundreds of lawyers led by Walter Dellinger, acting solicitor general in the Clinton administration, and Donald Verrilli, a solicitor general under President Barack Obama, among others. Bob Bauer, a former White House counsel to Obama, and Biden campaign general counsel Dana Remus are focused on protecting the rights of voters, who have been enduring long lines at polling places around the country on the belief that the presidential election will be decided by their ballots.

Both sides are informed by the experience of the 2000 election, which was ultimately decided by the Supreme Court in Bush v. Gore. But this year, because Trump has pushed unsubstantiated claims about the potential for voter fraud with increased voting by mail, sowing doubt about the integrity of the result, lawyers are preparing for a return trip before the high court.