This follows concerns among teachers that a statutory duty upon teachers to prevent students from being drawn into terrorism is actually closing space for debate and leading to radicalisation.

Teachers argue that there are already “long established and robust” safeguarding mechanisms in schools to spot potential radicalisation among pupils.

However, the Counter Terrorism and Security Act places a statutory duty on teachers to prevent young people from being “drawn into terrorism”.

Already, there have been cases where pupils have been wrongly referred to the authorities for comments they made in class and some teachers are shutting down spaces of debate as a result, the motion will say.

Speaking ahead of the motion, which will be discussed at the NUT’s annual conference in Brighton on Saturday, Christine Blower, the union’s general secretary, said: “The precursor position for us is that teachers know that they have a moral as well as a professional responsibility to keep young people safe. That’s keeping them safe from everything from sexual grooming to preventing them from becoming radicalised not just from Islam but also from extreme right wing ideas.