During a debate in the Commons on Iraq, he has just intervened on Foreign Secretary, David Miliband, seeking a promise that there would be a full inquiry into the Iraq War "as soon as practicable after 31st July".
Mr Miliband's reply was a simple "Yes".
According to PoliticsHome, he went on to say:
4.30pm Update: Shadow Foreign Secretary William Hague has issued the following reaction:
“We now call on the Government to ensure that the inquiry is announced before the summer recess, that its remit is set out in a statement to Parliament and that without any further delay the Leader of the Opposition and Privy Councillors in Opposition parties are consulted about establishing the Inquiry.”