Donald Trump arrived Monday at a New York court for the start of jury selection in his hush money trial, marking a historic moment as the former president and presumptive nominee for this year’s Republican presidential ticket answers to criminal charges.

It’s the first criminal trial of any former U.S. commander-in-chief and the first of Trump’s four indictments to go to trial. Scores of people are expected to be called into the courtroom to begin the process of finding 12 jurors, plus six alternates. Trump’s notoriety would make the process a near-herculean task in any year, but it’s likely to be especially challenging now.