The internal Tory process looking at Mr Johnson's comparison of Muslim women in face coverings with "bank robbers" or "letter boxes" was automatically triggered on Thursday after party headquarters received several complaints.
Senior figures such as Chairman Lewis and Prime Minister Theresa May have called on Johnson to apologize, and Muslim advocacy groups such as the Muslim Council of Britain have called for more action to be taken against Islamophobia in the Conservative Party.
If Mr Johnson's comments are found to have breached the party code of conduct, he may face a string of punitive measures.
"As a lifelong beneficiary of the freedom to make jokes about religion, I do think that Boris Johnson's joke about wearers of the burqa resembling letterboxes is a pretty good one", Atkinson wrote in a letter to The Times newspaper, published on Friday.
Duncan Smith added: "Lots of people of different religions have had abusive things said in jokes by comedians".
"You should really only apologise for a bad joke".
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But with anger from the Brexit wing of the party over even starting the process, party headquarters confirmed that Mr Lewis - who has already criticised Mr Johnson's comments - would not pick the panel.
The letter also said that Johnson's choice of Islamophobic words was deliberate and "was made to inflame tensions in a way that makes it easier for bigots to justify hate crime against us", adding further support to Tory peer Lord Sheik's request that Johnson lose the party whip, meaning he would no longer represent the party. 'He hasn't committed any offence'Andrew Mitchell, Tory MP for Sutton Coldfield " I don't think he should apologise.
"I think a lot of your listeners will be deeply anxious about the state of our democracy and free speech", he told talkRadio.
He went on to say: "But let's look at what Boris said: he expressed himself in quite colourful language".
He explained there was a complaints procedure within the Conservative Party and that the Party had a mechanism for dealing with these issues. "But he hasn't committed any offence".