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.
Former Prime Minister Tony Blair and ex-Foreign Secretary Jack Straw should give evidence to a parliamentary panel about Britain's alleged links to torture if required, Alan Johnson has said.
The former Home Secretary said the UK must obtain the damning report into the CIA's post-9/11 interrogation programme in full to examine the UK's alleged involvement.
Mr Johnson told the BBC's Andrew Marr Show that he and ex-Foreign Secretary David Miliband conducted a "thorough investigation" into allegations of torture while they were in government.
"We could find no evidence of British agents being involved [in torture]," he said.
"I'm absolutely convinced that what was redacted, was what the Home Office says they wanted redacted."
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)