In the 1988 Zündel trial, Irving repeated and defended his claim from Hitler's War that until October 1943 Hitler knew nothing about the actual implementation of the Final Solution.
For publishing and writing the foreword to Auschwitz The End of the Line, on 20 June 1989 Irving together with Leuchter was condemned in an Early Day Motion of the House of Commons as "Hitler's heirs" [REF].