Roberts a pivotal vote in the Supreme Court's big opinions

FILE - In this Jan. 21, 2020, file photo Supreme Court Chief Justice John Roberts arrives at the Capitol in Washington. Roberts told graduating seniors at his son's high school that the coronavirus has “pierced our illusion of certainty and control" and counseled them to make their way in a world turned upside down with humility, compassion and courage. (AP Photo/Cliff Owen, File)

FILE - In this Jan. 16, 2020, file photo Chief Justice of the United States, John Roberts walks to the Senate chamber at the Capitol in Washington. Roberts told graduating seniors at his son's high school that the coronavirus has “pierced our illusion of certainty and control" and counseled them to make their way in a world turned upside down with humility, compassion and courage. (AP Photo/Matt Rourke, File)

Anti-abortion protesters wait outside the Supreme Court for a decision, Monday, June 29, 2020 in Washington on the Louisiana case, Russo v. June Medical Services LLC. (AP Photo/Patrick Semansky)