Researchers say his goal scoring ability and kind personality are behind a drop in anti-Muslim hate crimes in Liverpool.
In a letter to the Equalities and Human Rights Commission (EHRC), the MCB said there was an “institutional problem” with the Party.
The Conservative Party has been given a month to reply to the EHRC’s request for further information regarding the nature of the complaints.
Head of UK counter-terrorism policing Neil Basu said the wording was “simply too broad to be effective” and could undermine investigations.
Baroness Warsi claimed Theresa May had failed to act on her concerns about the issue.
The Tories' investigation into Boris Johnson's comments over the burka cannot be a "whitewash" the Muslim Council of Britain has said.
Counter-terrorism police are investigating after the letters were reportedly delivered to households across the country.