A federal judge placed on hold a Trump administration effort to use typically confidential tax information to deport migrants, writing today that the IRS had illegally disseminated the tax data of some migrants this summer.

The order comes in a case, brought by a taxpayer advocacy group, that challenged an IRS decision to provide migrants’ addresses, as included on their tax returns, to Immigration and Customs Enforcement. Federal law tightly controls the use of taxpayer information, and several top IRS officials quit this spring over concerns that giving tax records to ICE on a large scale could be illegal.

Still, officials from the two agencies worked for months to create a process for ICE officials to access addresses on record with the IRS. In June, ICE asked the IRS for information

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