Several hundred Manhattan residents were recently sent notices to appear at the borough’s criminal court on April 15. Whether they know it or not, they’re under consideration to be jurors in perhaps the most high-profile criminal trial in U.S. history.

Lawyers for former President Donald Trump and Manhattan prosecutors are poised to scrutinize more than 500 potential jurors when his trial gets underway, according to two sources, a staggering number that reflects the magnitude of the case itself.

The attorneys will review their responses to lengthy questionnaires before interviewing many of them individually in court, with the goal of reaching consensus on who should be selected. It’s an arduous process that’s designed to ferret out prospective jurors who can’t put aside their biases, and it could take days or even weeks.

Ultimately, the group will be whittled down to 12 jurors and a few alternates. They’ll be tasked with deciding whether the former president illegally falsified business records after his attorney paid “hush money” to an adult film star days before the 2016 election. He faces 34 felony counts and has pleaded not guilty.