Liam Neeson
Mark Felt

Diane Lane
Audrey Felt

Maika Monroe
Joan Felt

Wendi McLendon-Covey
Carol Tschudy

Julian Morris
Bob Woodward

Josh Lucas
Charlie Bates

Tony Goldwyn
Ed Miller

Kate Walsh
Pat Miller

Michael C. Hall
John Dean

Marton Csokas
Pat Gray

Tom Sizemore
Bill Sullivan

Ike Barinholtz
Angelo Lano

Bruce Greenwood
Sandy Smith

Brian d'Arcy James
Robert Kunkel

Noah Wyle
Stan Pottinger

Eddie Marsan
Agency Man

Wayne Pére
John Ehrlichman

Stephen Michael Ayers
John Mitchell

Darryl Cox
Richard Kleindienst

Scott Poythress
Gray's Flack

Jeff Sprauve
Undercover Agent

Frank Hoyt Taylor
Senator #1

Charles Green
Reverend

John Chancellor
Self (archive footage) (uncredited)

Walter Cronkite
Self (archive footage) (uncredited)

Richard Nixon
Self (archive footage) (uncredited)

Pat Nixon
Self (archive footage) (uncredited)

Spiro Agnew
Self (archive footage - uncredited)