"The Supreme Court blocked Congress from receiving grand-jury materials from Robert Mueller’s investigation of Russia’s interference in the 2016 election."

"The court, in a written order Wednesday, granted an emergency request by the Trump administration to keep the materials secret while it mounts a full high court appeal against their release. The high court’s action increases the chances that the information will remain shielded through the 2020 election.... The Justice Department argued that disclosure of the grand-jury materials would mean its secrecy would be irretrievably lost. For the grand-jury process to work, secrecy must be assured for witnesses to come forward and testify fully, the department said. It also said the committee hadn’t shown that the material was urgently needed 'for a hypothetical second impeachment.'"

The Wall Street Journal reports (without a paywall).