Federal prosecutors have for months been using a grand jury to investigate former FBI deputy director Andrew McCabe — an indication the probe into whether he misled officials exploring his role in a controversial media disclosure has intensified, two people familiar with the matter said. The grand jury has summoned more than one witness, the people said, and the case is ongoing. The people declined to identify those who had been called to testify. The presence of the grand jury shows prosecutors are treating the matter seriously, locking in the accounts of witnesses who might later have to testify at...
