The Internal Revenue Service has agreed to share immigrants’ tax data with Immigration and Customs Enforcement for the purpose of identifying and deporting people illegally in the U.S., according to a document signed by Treasury Secretary Scott Bessent and Department of Homeland Security Secretary Kristi Noem.

The new data-sharing arrangement was signed on Monday in the form of a “memorandum of understanding” — found in federal court filings — and will allow ICE to submit names and addresses of immigrants inside the U.S. illegally to the IRS for cross-verification against tax records.

Treasury argues that the agreement will help carry out President Donald Trump’s agenda to secure U.S. borders and is part of his larger nationwide immigration crackdown, which has resulted in deportations, workplace raids, and the use of an 18th century wartime law to deport Venezuelan migrants.

Advocates, however, say the IRS-DHS information sharing agreement violates longstanding privacy laws and diminishes the privacy of all Americans.