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.
The Senate Committee that wrote the devastating report on CIA secret detention met 24 times with British officials, it has been revealed.
But a former Security Minister described some of the claims about his role in the meetings as "absolute rubbish".
The Government has insisted redactions made to the report at the request of the UK did not relate to alleged mistreatment of detainees.
But Deputy Prime Minister Nick Clegg has said there could yet be a full judicial inquiry into what, if any, involvement the UK had.
ITV News Political Correspondent Carl Dinnen reports.
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)