The school at the centre of the row over alleged Muslim extremism in Birmingham has been criticised in an official report.
ITV News understands that an Ofsted investigation of Park View School found children were not protected from extremist views and that leadership was weak.
Prime Minister David Cameron has defended the government's handling of the affair, adding that he would be stepping in to "sort out" a dispute between the Home Secretary Theresa May and Education Secretary Michael Gove.
ITV News correspondent Rupert Evelyn reports:
The leaking, from her department, of a letter to Michael Gove, raises serious questions for the Home Secretary to answer.
One school was praised by Ofsted for using money from the pupil premium to pay for a number of cultural trips to Saudi Arabia.
Six Birmingham schools will be rated 'inadequate' and several more downgraded. Council officials have been criticised for failing to act.