Blair, along with his former foreign secretary Jack Straw and his attorney general Peter Smith, have been accused of the crime of "aggression" in a private case based on findings by the Chilcot Report, a long-delayed inquiry into Britain's role in the US-led invasion which came out last July.

The Chilcot Inquiry, established in 2009 to investigate Britain's most controversial military engagement since the end of the Second World War, called the invasion "unnecessary" and said Blair decided to go in based on "flawed" intelligence about Iraq's supposed weapons of mass destruction (WMD).

According to The Guardian, Wright, who is a Tory Member of Parliament, has reportedly asked to join the hearings following a judge's ruling last November that Blair had immunity from prosecution because it could "involve details being disclosed under the Official Secrets Act."