Livingstone said today that he had only made a "statement of fact" concerning Hitler that had been seized on by his political enemies to stir up trouble.
Livingstone has been suspended from Labour's National Executive Council because of his comments and party leader Jeremy Corbyn has launched an independent inquiry into anti-Semitism and other forms of racism in the party.
The uproar over Livingstone's comments has unsettled Labour backers ahead of Thursday's elections, which include choosing a new London Mayor.