CassandraX

The former foreign secretary Jack Straw is to face potentially explosive questioning at the Iraq inquiry next month over a private letter he sent to Tony Blair on the eve of the invasion, urging the prime minister to look at options apart from pressing ahead with British military involvement in the attack.

It is understood that the inquiry is to receive a copy of the personal letter sent by Straw, written after discussions with Sir Michael (now Lord) Jay, the Foreign Office permanent secretary, on 16 March 2003, two days before the Commons voted to back the war.

Straw was yesterday named by the Chilcot inquiry into the Iraq war as one of its star witnesses next month. Ten serving or former cabinet ministers have been called, including Tony Blair, the former attorney general Lord Goldsmith and the former defence secretary Geoff Hoon.