The Deputy Prime Minister has turned on the coalition's education policy accusing his Conservative partners of failing to enforce "basic standards" in schools.
Nick Clegg said he would disown key "ideological" planks of the coalition's education policy in a speech on Thursday.
Accusing the Conservatives of letting ideology get in the way of education, he said he wanted to see all children being taught the national curriculum by qualified teachers.
The Conservative Education Minister Elizabeth Truss said she was "surprised" by Mr Clegg's comments and suggested there was a "divergence of opinions" within his own party.
ITV News' Political Correspondent Claire Stewart reports:
Mr Clegg insisted today that his split with government policy was prompted by a "perfectly sincere difference of opinion" and that it was not "a coalition crisis".
Speaking to ITV News, Ms Truss defended the government's policy of affording free schools and academies certain freedoms in order to encourage innovation.
She said that Mr Clegg's views appeared to be at odds with members of his own party, including the schools minister David Laws and former minister Jeremy Browne.
Labour's shadow education secretary Tristam Hunt welcomed Mr Clegg's comments, saying: "We would be happy to work with him to reintroduce accountability, proper standards and qualified teachers in all our schools across the country."