At the same time, the IRS is sending questionnaires to some groups that self-declare their tax-exempt status, seeking more information on their political activity, and it is reviewing tax returns of some exempt groups to make sure they are complying with rules imposing a tax on some of their political activities, tax experts say.

WSJ: IRS Apologizes for Scrutiny of Conservative Groups

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Letters provided to CNN show IRS officials in Washington and California contacted conservative groups to demand more information before approving the groups' requests for tax-exempt status.

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