"By 2003, he’d been in power for six years and seen off three Tory leaders. He was the supreme master of the country with no serious challenger.
"He had come to believe in his own rightness, having taken a series of foreign policy decisions - in Kosovo in 1999 and Sierra Leone in 2002 - that appeared to vindicate his judgment.
"After 9/11, he took to the skies and for some months was the most powerful figure in the West."
The New Labour leader has once again been lambasted for his decisions in Downing Street during the 2000s following the criticisms of the Chilcot Inquiry.
Following the publication of the report, Mr Blair made a speechjust over 45 minutes in length taking "full responsibility" for the war expressing his "sorrow, regret and apology" over "failures" in Iraq.However, he declared he stands by his decision to invade and would do the same again.
Sir Anthony wrote: "He will go down in history as the man who rushed into a poor decision on the basis of flawed evidence and with insufficient military preparation, which resulted in the death of 179 British soldiers and countless Iraqis.
"His self-belief now prevents him from admitting his mistake and saying the one word that would restore trust and bring peace to him and spread reconciliation: 'Sorry'."