This bill would give the Treasury Secretary authority to revoke the tax-exempt status of organizations that provide material support to designated terrorist organizations. Specifically, it defines "terrorist supporting organizations" as groups that have provided substantial financial or other support to terrorist entities over a three-year period. Before revoking tax-exempt status, the Treasury Secretary must notify the organization in writing about the alleged support and give it 90 days to either prove it didn't provide the support or certify that it has returned the resources and will not provide further support. Organizations can appeal the decision through the IRS and federal district courts, with protections for classified information used in the determination. The bill would take effect upon enactment and apply to any designations made after that date.