A federal judge on Thursday ordered that the videotape of Hillary Clinton’s former chief of staff giving a deposition later this week be sealed so it can’t be used in political attacks against the former secretary of state and likely Democratic presidential nominee. Judge Emmett G. Sullivan said the transcript will be made public, so the public will know what Cheryl Mills says. He said it was “unnecessary” to have the video released. He extended that order to all of the depositions being taken in the open-records case, which also applies to Mrs. Clinton’s closest personal aide, Huma Abedin. Neither...