Ahmed Rehab says the position was revoked because of a false anti-Muslim blog attacking Kifah. "There was nothing that would prevent him from fulfilling this role. Except for the fact that somebody out there wished to smear him and the ISP was either too lazy or incompetent to actually sift through the smears and figure out that they were smears. And instead decided to drop him to avoid any controversy. That's unacceptable," said Rehab.

In December, community and religious groups hailed Mustapha's appointment as a nod to the growing diversity among the agency's nearly 2,000 officers. Since 2002, Mustapha has been an imam and director at the Mosque Foundation in Bridgeview, one of the Chicago area's oldest and largest mosques. He also served as a designated chaplain with the U.S. Federal Emergency Management Agency, helping to counsel Hurricane Katrina victims.

The lawsuit filed by the Council on American-Islamic Relations' Chicago chapter alleges discrimination based on race, religion and national origin. The suit also says Mustapha was denied his First Amendment right to freedom of association, which bars the government from imposing guilt by association. It calls for Mustapha's immediate reinstatement.

"He is a man of great integrity...He's looking to truly serve his country and his community. Muslims who serve every day in the Illinois State Police deserve a chaplain of their own faith," said Ahmed Rehab, Council on American-Islamic Relations (CAIR). "Our concern is that the Illinois State Police is kowtowing to articles online published by notorious anti-Muslims who have been in the business of smearing Muslim activists leaders and Imams for the longest time," said Rehab

"It is essentially guilt by association," said Christina Abraham.