David Evans, Secretary of the National Union of Teachers (NUT) Cymru, said they back the comprehensive schools system fully.
He said "it suits us - its suits the people of Wales - it suits the children of Wales."
The last grammar school in Wales closed in 1988, but the Welsh Conservatives are calling for a return to the grammar system.
More top news
More than half of adults in Wales have experienced harm or a negative experience because of someone else's drinking, a new report has found.
A major review will be published later this morning into student finance and higher education in Wales.
Dull and damp for much of Wales as we start the day, with drier and brighter weather on the way this afternoon.