Imam Taj Hargey, from the Oxford Islamic Congregation said the Tory MP has nothing to apologise for and 'did not go far enough' in his remarks.
He branded the burqa a 'hideous tribal ninja-like garment' and said its has 'no Koranic legitimacy'.
Writing in The Times, he said: 'Boris Johnson should not apologise for telling the truth.'
He said the ex minister had reminded the country that the face mask 'has no Koranic legitimacy' but is 'a nefarious component of a trendy gateway theology for religious extremism and militant Islam'.
He added: 'The burqa and niqab are hideous tribal ninja-like garments that are pre-Islamic, non-Koranic and therefore un-Muslim.
'Although this deliberate identity-concealing contraption is banned at the Kaaba in Mecca it is permitted in Britain, thus precipitating security risks, accelerating vitamin D deficiency, endorsing gender-inequality and inhibiting community cohesion.'
He said that some backward-looking elements in the Muslim community have managed to persuade may in British society that it is in the Islamic faith for women to cover their faces.
But he said this must be challenged in Britain and that the state should step in to stop it.
I did not know it was banned at the Kaaba