The DUP has accused nationalist parties of trying to destroy grammar schools after a heated Assembly debate on academic selection and the transfer test.
While a Sinn Fein motion with an SDLP amendment calling on the Education Minister to end transfer tests was passed by 48 votes to 37, Peter Weir told MLAs he would not be giving an undertaking to remove academic selection.
The motion called on the minister "to end academic selection as a means of determining post-primary transfer".
It passed with an SDLP amendment calling on the minister to "replace it with a system that has the widest support and prioritises educational excellence for all without academic selection".
Introducing the motion, Sinn Fein's Pat Sheehan argued "there is little evidence" social mobility is increased by academic selection.
"More than 60% of children fail the transfer test," he told the Assembly.
"It's the other side of the coin. It's academic rejection."
The DUP responded saying this wasn't a choice between having academic selection or not, it was between selection by ability and selection by ability to pay.
The party's Robin Newton said the motion was nothing more than "another attempt by Sinn Fein to destroy grammar schools in all but name".
DUP colleague Maurice Bradley said removal of academic selection would be "the first step on the path to a comprehensive system".
Ulster Unionist Mike Nesbitt added the debate was concentrating on "only one small piece of a very large jigsaw".
He asked those opposed to academic selection if they "would select a choir by taking the first 50 people to arrive, or by taking the best singers?"
The SDLP's Matthew O'Toole responded saying "the evidence simply isn't there" to support academic selection,
"If it was so crazy to abolish academic selection at 11 then why is every other jurisdiction in the western world doing it?" he argued.
TUV leader Jim Allister challenged those who had brought the motion to the Assembly for "another chest-beating debate".
"If change is wanted then why have none of the Members brought a Private Member's Bill," he asked.
While the motion called on the Education Minister to act, he is not compelled to do so.