Special counsel Robert Mueller, who is investigating Russian interference in the 2016 election and whether the Trump campaign colluded with the Kremlin, has begun questioning White House staffers as part of the probe.

Retired Lt. Gen. Keith Kellogg, the chief of staff for the National Security Council, was interviewed Thursday about former national security adviser Mike Flynn, and may have been shown records related to the investigation, according to a Fox News report Friday.

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