Sen. Jeff Flake announced Wednesday that he will not vote to advance any new judicial nominees through the Judiciary Committee, nor will he vote to confirm picks on the Senate floor, until he gets his way on unrelated legislation to prevent the firing of special counsel Robert Mueller. Mr. Flake made the announcement on the Senate floor minutes after his bid to pass the bill failed. His threat could block the committee from approving any more judges this year, since the GOP only holds a one-seat majority on the panel. It’s less catastrophic to approving judges on the Senate floor,...