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
Chelsea fans are at the centre of a new racism storm after video emerged of supporters mocking the recent racist incident on a Paris Metro.
NASA's Dawn probe is preparing to make an historic rendezvous with the dwarf planet Ceres.
A US Twitter study has found that there are almost 50,000 active pro-Islamic State accounts, but say the number could be as high as 90,000.