The Foreign Secretary William Hague said the row between Home Secretary Theresa May and Education Secretary Michael Gove was a "disciplinary matter within the Government which the Prime Minister has dealt with in a very firm and clear way".
Speaking on the BBC1's Andrew Marr show, he said David Cameron was "making sure there was team discipline within the government" and that the Government would take a "robust" approach to extremism.
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.