Meanwhile, the American Center for Law and Justice, a conservative legal organization, brought the lawsuit on behalf of the groups in U.S. District Court in Washington.

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On August 4, the American Center for Law and Justice filed a pro-bono lawsuit on behalf of firefighter and first responder Tim Brown, a founder of the Coalition.

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Ms. Mitchell and another lawyer representing tea-party groups, Jay Sekulow of the conservative American Center for Law and Justice, both said they sent letters demanding that groups they represent be approved for tax-exempt status.

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