(CNN) — The Internal Revenue Service began sharing sensitive taxpayer data this week with immigration authorities searching for undocumented migrants, according to two sources familiar with the matter.

As part of President Donald Trump’s massive deportation push, the Treasury Department and the Department of Homeland Security signed an agreement in April to turn over information about undocumented immigrants who DHS says are already facing deportation orders and are under federal criminal investigation.

While the IRS has disclosed sensitive tax data previously for specific reasons allowable under privacy law, the agency has never shared such large volumes of data with any agency for the sole purpose of large-scale immigration enforcement.

The records include personal information like na

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