Johnson has so far resisted pressure from Lewis, numerous MPs, and the Prime Minister Theresa May herself, to apologise for his comments.
Boris Johnson is facing a Conservative Party investigation into comments he made comparing Muslim women in burkas to letterboxes and bank robbers.
Former attorney general Dominic Grieve said he would quit the party if Johnson became leader, while Anna Soubry said that "many" One Nation Tories would also leave.
Mr Johnson has resisted calls to say sorry after writing in his Daily Telegraph column that face coverings are "ridiculous" and "weird", and that women who wear them look like bank robbers and letter boxes.
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The party declined to comment on the disciplinary procedure.
In the first instance, Johnson - a leading figure of in the campaign to Leave the European Union - will be scrutinised by a party investigator.
Johnson, a former journalist who resigned as foreign secretary in July to protest againstMay's "softBrexit" policy, wrote that he felt "fully entitled" to expect women to remove face coverings when talking to him at his constituencyoffice.
A spokesman said only: "The code of conduct process is strictly confidential".
In response to Johnson's remarks, the Muslim Council of Britain said that Johnson was "pandering to the far right" with his remarks.
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Officials said they believe the suspect left a bicycle and walked from there to the lemonade stand before the robbery took place. - Deputies in North Carolina say they're on the lookout for a teenager who robbed a 9-year-old's lemonade stand at gunpoint.
Shortly after the publication of his article on Monday, a source close to Mr Johnson said that it was "ridiculous" that his views should be under attack.
"With everything else going on in London to be diverting resources into an even cursory investigation into an article is freaky", Mr Burns said according to The Telegraph.
Leading Brexiteer Jacob Rees-Mogg has claimed the Prime Minister was wrong to tell him to apologise.
The letter, seen exclusively by Sky News, says an apology would be "insufficient" and that Mr Johnson made a "deliberate choice" to "inflame tensions in a way that makes it easier for bigots to justify hate crime against us".
Other than Armeena Khan, the former United Kingdom mayor had received responses from many other personalities including former Attorney General Dominic Grieve, Theresa May, Brandon Lewis and Ruth Davidson. "He should not have used it", May said.
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