He said he did not know whether a Truth and Reconciliation Commission was the best way to do it, but there needed to be some way to allow people to express their "grief, pain and anger".

BBC: NEWS | UK | Northern Ireland | Cory reports: what was said

But he said that after reading a 300-page summary of a 6, 000-page report on CIA interrogation and detention policies, he did "not know what the truth is".

BBC: CIA nominee John Brennan defends drone strikes