WASHINGTON—The Supreme Court will decide whether Congress can have grand-jury materials from the Mueller probe of Russian election interference, likely delaying any release until after the election.

The high court in a brief written order Thursday said it would hear an appeal by the Trump administration that is seeking to keep the materials from being released. The justices in May had temporarily blocked release of the grand jury information, a signal the court was likely to take up the case in full. The court’s action likely…

Read More