Tracy Letts
as Fritz Beebe
Matthew Rhys
as Daniel Ellsberg
Carrie Coon
as Meg Greenfield
David Cross
as Howard Simons
Jesse Plemons
as Roger Clark
Michael Stuhlbarg
as Abe Rosenthal
Zach Woods
as Tony Essaye
Jessie Mueller
as Judith Martin
Jon Donahue
as Bertram Plain