The Supreme Court on Thursday confirmed it will hear a Trump administration appeal to shield secret grand jury materials from the Mueller investigation from the Democratic-controlled House.

Why it matters: The move will likely extend the legal battle over the documents into next year, essentially guaranteeing that Democrats won't get them before the election. Democrats in the House Judiciary Committee sought to obtain the records as part of their impeachment inquiry last year.

Details: The court said it will review an order from a lower court for the Department of Justice to hand over redacted parts of Mueller's final report, along with grand jury transcripts.

• Grand jury records are usually kept secret, but a judge can authorize to disclose them during “judicial proceedings.” The legal question is whether the House's impeachment inquiry falls under that.
• A federal appeals court previously ruled Democrats could gain access to the materials. But the Supreme Court temporarily blocked the DOJ from handing it over in May, and extended that ruling today.

What's next: The court will consider the case in the term that starts this October.