Under the agreement, Immigration and Customs Enforcement could submit names and addresses of suspected undocumented immigrants to the IRS to cross-reference with confidential taxpayer databases.

The Internal Revenue Service (IRS) is reportedly close to finalizing an agreement with Immigration and Customs Enforcement (ICE) that would allow agency officials to use tax data to confirm the names and addresses of people suspected of being in the United States illegally.

This would mark a significant shift in longstanding IRS policy, which has traditionally kept taxpayer information strictly confidential.