Fulham MP Greg Hands has said the Labour council forced Michael Gove to close down Fulham Boys School before it even opened.
A total of 84 boys were left devastated on Monday when the Department for Education (DfE) postponed the free school's application at the 11th-hour, meaning they will not be starting on September 8.
The department blamed difficulties in securing a permanent site for the Church of England free school , saying they will work with the local authority to help parents find other secondary schools for their children.
Fulham Boys School (FBS) was set to open in Gibbs Green, West Kensington where it would stay for two years on a contract with site owners, CapCo.
It was then meant to move into new buildings on the Parsons Green site of Sulivan Primary School which was going to merge into New King's School at its nearby site.
Sulivan parents, teachers and pupils have campaigned for a year to prevent its closure, even performing a Save Our Sulivan song outside Downing Street .
When Labour won the local elections on May 22, taking over the Conservative-led Hammersmith and Fulham Council, their first pledge was to save Sulivan School from closure .
Mr Hands said he is very disappointed FBS was not given approval to open in September as he has been a strong supporter of the new school for some years now.
He has spoken to education secretary, Mr Gove and education under secretary, Lord Nash before and since the decision to help make a case for the school.
He said: "They have made clear to me they feel they had little choice, given there was no guarantee, or even confidence, in finding a permanent site for the school in the short time frame available, now that the viability of the Sulivan site has been brought into question by the Council.
"Whilst I am disappointed with this decision, parents and local people should understand that it is a direct consequence of the new, Labour Council in Hammersmith & Fulham reversing policy on the merger of Sulivan and New King’s Schools, which would have provided the extra school places on the available site on Peterborough Road.
"In order words, it was the Labour council that cancelled the availability of the new site, which the Department felt left them with no choice but to postpone the opening of the school."
He added that he was confident if the Conservatives were still running the council, the school would have opened in September on the temporary site as a new school could have been built on the Sulivan site.
"However, the most important thing now is to do everything we can to find a new permanent site, or to get the council to re-consider its new proposal for the Sulivan site," he added.
"I am hoping we can now all work together to find a site for the Fulham Boys School and deliver some real progress on finding a new, permanent site, as soon as possible for local parents."
Mr Hands has persuaded Lord Nash to meet with him, and Alex Wade, chairman of FBS governors, to discuss where to go from here.
He also extended an invitation to the council, saying: "I repeat my offer to Hammersmith & Fulham Council, to also meet them and to work together in helping to find a new site."