A federal grand jury is investigating the handling of the Justice Department’s criminal investigation into Democratic Sen. Adam Schiff , according to a law enforcement source and a subpoena to a witness requesting information about her communications with individuals purporting to be involved in the probe.

The subpoena obtained by NBC News was sent to conservative activist Christine Bish, who testified before the grand jury Thursday. It asked for any records Bish has from anyone “claiming to be William Pulte,” the Trump administration ’s director of the Federal Housing Finance Agency, as well as anyone claiming to work for him, including as his chief of staff.

The subpoena also requested any communications or documentation Bish has from "anyone claiming to be acting at the direction

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