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WASHINGTON, DC - JUNE 21:  Special counsel Robert Mueller (2nd L) leaves after a closed meeting with members of the Senate Judiciary Committee June 21, 2017 at the Capitol in Washington, DC. The committee meets with Mueller to discuss the firing of former FBI Director James Comey.  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - JUNE 21:  Special counsel Robert Mueller (2nd L) leaves after a closed meeting with members of the Senate Judiciary Committee June 21, 2017 at the Capitol in Washington, DC. The committee meets with Mueller to discuss the firing of former FBI Director James Comey.  (Photo by Alex Wong/Getty Images)

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    Mueller biographer: Investigation bigger than you think

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Mueller biographer: Investigation bigger than you think

"He has conducted this investigation in precisely the way that you would expect Bob Mueller to be leading an FBI investigation," explains biographer Garrett Graff.

Mueller biographer: Investigation bigger than you think

"He has conducted this investigation in precisely the way that you would expect Bob Mueller to be leading an FBI investigation," explains biographer Garrett Graff.