Christine Blower, the general secretary of the National Union of Teachers, says Education Secretary Michael Gove is "isolated" in his view that GCSEs should be replaced.
She said: "Michael Gove and the Coalition Government's position on examination reform is now surely untenable. The Education Secretary is totally isolated in his view that the English Baccalaureate Certificates are a suitable measure to replace GCSEs."
More top news
Francois Hollande has urged British MPs to support David Cameron's plan to launch airstrikes against so-called Islamic State in Syria.
Teenage twin brothers were found guilty today of murdering a 'quiet, humble' father who dared to intervene in a robbery in north London.
Police have warned Black Friday web shoppers to change their passwords after a man was arrested for alleged cyber offences against Tesco.