The text of the letter is as follows:
I am writing to urge you to indicate immediately to Sir John Chilcot that it is your strong preference to go before the Iraq Inquiry ahead of the General Election.
Following developments yesterday at Alastair Campbell’s hearing, your personal role in the decisions that led to the war in Iraq has now come under the spotlight. The notion that your hearing should take place after the election in order that the Inquiry remains outside of party politics therefore no longer holds. On the contrary, the sense that you have been granted special treatment because of your position as Prime Minister will only serve to undermine the perceived independence of the Committee.
As I said to you across the floor of the Commons today, people have a right to know the truth about the part you played in this war before they cast their verdict on your Government’s record. I urge you to confirm publicly that should Sir John Chilcot invite you to give evidence to the Inquiry ahead of the election you will agree to do so.