Evidence is building that the probe conducted by Patrick Fitzgerald, special prosecutor, has extended beyond the leaking of a covert CIA agent's name to include questioning about the administration's handling of pre-Iraq war intelligence.

According to the Democratic National Committee, a majority of the nine members of the White House Iraq Group have been questioned by Mr Fitzgerald. The team, which included senior national security officials, was created in August 2002 to “educate the public” about the risk posed by weapons of mass destruction on Iraq.