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This is Fresh Air. I'm Terry Gross. As we near the presidential election, a new book answers a lot of questions about the Mueller investigation. Special Counsel Robert Mueller was appointed by acting Attorney General Rod

Rosenstein to investigate any links or coordination between the Russian

government and people associated with the 2016 Trump campaign, as well as other related matters including

possible obstruction of justice, witness tampering, or destruction of evidence.

The book takes us behind the scenes of the investigation.

It answers questions such as why the Special Counsel's Office didn't subpoena President Trump,

why no criminal charges against Trump were recommended,

and the reaction inside the Special Council's office when then Attorney General William Barr released his own inaccurate summary of the investigation.

That summary misled Americans about what the report's conclusions really were and

enabled Trump and the White House to incorrectly claim the report found no obstruction and

no collusion. The new book, Interference, the inside story of Trump,

Russia, and the Mueller investigation, is written by three lead members of Mueller's team,

including my guest, Aaron Zebbly.

He was Mueller's deputy during the investigation and was Mueller's chief of staff when Mueller

was the FBI director.

Zebbly oversaw the editing of the Mueller report.

Aaron Zebly, welcome to Fresh Air.

Can you describe your role in the investigation

...