This is a couple of weeks old, but Corbyn recently suggested it is possible that Blair could be faced with war crime charges over Iraq. Here: http://www.independent.co.uk/news/uk/politics/jeremy-corbyn-tony-blair-could-face-war-crimes-trial-over-illegal-iraq-invasion-10439020.html

Do you think Blair is a war criminal. Is so why?

FWIW, I simultaneously think Iraq was wrong and Blair is not a war criminal.