The request marks the Trump administration’s latest effort to devote more federal resources to fulfill his campaign pledge to deport millions of undocumented immigrants.

The U.S. Department of Homeland Security wants to deputize some Internal Revenue Service criminal investigators and other Treasury Department personnel to perform immigration enforcement, according to a DHS document and an agency spokesperson.

Although the Internal Revenue Service has the responsibility of collecting taxes, some members of the department could soon have more duties added to their roles. U.S. Homeland Security Secretary Kristi Noem asked the Department of the Treasury to deputize some law enforcement workers to assist with immigration enforcement in a memo obtained by the Wall Street Journal.