On the same day Hillary Clinton met with the FBI as part of the ongoing investigation into her use of a private email server, her former chief of staff Cheryl Mills was seen leaving Clinton’s residence.

Clinton met with agents for more than three hours on Saturday at FBI headquarters and Fox News showed video of Mills leaving Clinton’s home around 10:00 a.m..

Complicating matters, Mills is a witness in the case… allegedly a cooperative witness, though Mills and her lawyer got up and walked out of the room while being questioned by the FBI in May because an agent brought up a topic sources say was agreed to be off-limits.

Why a witness in the investigation would be meeting with Clinton makes for an interesting question, but Team Hillary released a statement Saturday downplaying the FBI grilling as a “voluntary interview.”

“Secretary Clinton gave a voluntary interview this morning about her email arrangements while she was Secretary. She is pleased to have had the opportunity to assist the Department of Justice in bringing this review to a conclusion. Out of respect for the investigative process, she will not comment further on her interview.”

Clinton repeated the talking point later, telling NBC’s Chuck Todd, “I’ve been eager to do it, and I was pleased to have the opportunity to assist the department in bringing its review to a conclusion.”

It all may be a moot point anyway, as CNN and others are already reporting that no charges will be filed against Clinton.

Fox News’ Catherine Herridge reported that Mills, who was Clinton’s chief of staff throughout her four years as secretary of state, was accompanied by seven attorneys when she gave her deposition.

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