Former Foreign Secretary Johnson, 54, is under fire after describing women who wear the full face and body veil as "mailboxes," and compared them to bank robbers and rebellious teenagers.
His comments in his Daily Telegraph column have sparked outrage among many, calling the former mayor of London Islamophobic.
But the leading Imam, Dr. Taj Hargey of the Islamic Congregation of Oxford, says that the MP has nothing to apologize for.
In a letter to The Times, Dr. Hargey wrote: "The burqa and the niqab are horrible ninja-type tribal garments that are pre-Islamic, not Quranic and, therefore, non-Muslim."
He went on to say that facial veils prevent Muslim communities from integrating and enforcing "gender inequality".
Dr. Hargey added that Boris's column on Monday "did not go far enough" and said he should not "apologize for telling the truth".
And he noted that the burka, which he called a "deliberate contraption that conceals identity," is forbidden in the Kaaba in the Muslim holy city of Mecca.
He called on Britain to join "France, Belgium, Austria, Bulgaria and Denmark to ban the burka".
"The burqa and the niqab are horrible tribal ninja garments"
Dr. Taj Hargey
Boris had an unlikely supporter when actor and comedian Rowan Atkinson called the burka a "joke."
He has refused to back down, even though the conservative Muslim colleague Lord Sheikh asks him to apologize.
Theresa May also joined the army of critics, saying that Boris "obviously offended" some people.
"I think we should all be very careful with the language and the terms we use," he added.