And while I am it, I want to say something to the National Union of Students. When you choose to ally yourselves with an organisation like CAGE, which called Jihadi John a “beautiful young man” and told people to “support the jihad” in Iraq and Afghanistan, it really does, in my opinion, shame your organisation and your noble history of campaigning for justice.

David Cameron: When David Irving goes to a university to deny the Holocaust – university leaders rightly come out and condemn him. They don’t deny his right to speak but they do challenge what he says. But when an Islamist extremist goes there to promote their poisonous ideology, too often university leaders look the other way through a mixture of misguided liberalism and cultural sensitivity.

Sarah Haider: There is a curious double-standard at play. When Muslim clerics and activists that are known to be anti-Semites and homophobes are welcomed on campuses, touring nationally, invited to give lectures by Muslim student associations, while feminists like Asra Nomani, who has been fighting for the equality of the sexes, for the right of female entry to the priestly class, is branded as a bigot by the same Muslim student organizations and the authorities at universities like Duke succumb to this brazen attempt to silence her.

Similar patterns are repeated across the Western world. Maryam Namazie, who is an ex-Muslim activist, was dis-invited to speak at Trinity, Ayaan Hirsi Ali at Brandeis. The British Students Union now allies itself broadly with Islamist organizations such as CAGE. To quote Nick Cohen from his article from the Guardian, “University managers are no better than their teenage heresy hunters. They say they want to oppose radical Islam in argument. The Lawyers’ Secular Society took them at their word. It tried to present an investigation at the University of West London into Islamist groups that were all over campuses, despite their record of advocating Jew hatred, homophobia and misogyny. The university authorities banned the secularists.”

Let me be clear. I don’t think anyone, even bigots emerging from Muslim communities or anywhere else, should be silenced. What I ask is that we stand up for the right to speak of all, including those both those who stand with us and those who call for the death of our fellow dis-believers.