Jeremy Corbyn is preparing to call for Tony Blair to be investigated for war crimes in the wake of a damning Chilcot report into Britain's involvement in the Iraq War, the Telegraph understands.

The former Labour Prime Minister's reputation is expected to be seriously "damaged" by the upcoming Inquiry, according to a senior source who has discussed the report with its authors.

It is understood that Mr Corbyn will not row back from calls he made last year for Mr Blair to stand trial for war crimes if he is found to have broken the law over the 2003 conflict.