A federal judge wants the defense and prosecution each to provide a list of potential witnesses as jury screening begins in Dylann Roof's trial stemming from the Charleston church shootings.

In a Tuesday order, U.S. District Judge Richard Gergel said he wants the lists included on a questionnaire to determine if potential jurors know any witnesses. The order says attorneys should make the lists available to the court but do not have to share them with the other side.

The 22-year-old Roof faces the death penalty in his November federal trial on hate crimes and other charges stemming from the June 2015 slayings of nine people at Emanuel AME Church.

A pool of 3,000 potential jurors begins reporting to the courthouse later this month for initial screening.