Theresa May faces questions over her role in the parts which were redacted from the American Senate's damning report on torture techniques used by the CIA after 9/11.
MPs on the influential Home Affairs Select Committee want to know whether she asked for sections to be redacted because they could embarrass Westminster.
Nick Clegg has called for Tony Blair and Jack Straw to give evidence about the UK's role in a brutal CIA-led interrogation and torture programme that was revealed last week..
The Deputy Prime Minister said those in charge at the time that CIA torture took place must answer questions about any British involvement and anyone found to have been complicit in torture must face the "full rule of the law."
He said: "The next pragmatic step is to let the police get on with their work as soon as possible but also ... to go, as Malcolm Rifkind has said, in pursuit of the truth without any fear or favour, including calling as witnesses, as individuals who need to be further questioned, politicians who were in charge ... of the government at the time."
A former US Vice President has condemned a shocking report into interrogation techniques used by the CIA, slamming it as "full of crap".
While it seems beyond the realms of possibility now, things can change, what is unlikely now is conceivable in 30 years time.
Shocking details about the CIA's "brutal" interrogation techniques have been laid bare. (Note: graphic descriptions may cause upset)