David Cameron has said lessons must be learned "and keep being learned" from the Iraq War.
The Prime Minister said taking the country to war "should always be a last resort" that is only done if all credible alternatives have been exhausted.
If the "difficult" decision to intervene in other countries is taken then proper planning for what follows is vital.
And our armed forces must always be properly equipped and resourced, he added.
Alex Salmond told Peston on Sunday that he was backing the motion because a "verdict" on Blair was needed.
The long-awaited publication of the Chilcot report has raised many questions - we take a look at some of the key issues.
Thursday morning's newspapers were no less critical of Tony Blair than Sir John Chilcot's report into the Iraq war itself.