S. 4326 would authorize Immigration and Customs Enforcement (ICE) to operate Transnational Criminal Investigative Units (TCIUs)—teams of foreign law enforcement officials working with ICE to investigate and prosecute individuals involved in transnational criminal activity. The bill also would authorize ICE to pay stipends to TCIU members. CBO estimates that enacting S. 4326 would not affect direct spending or revenues. CBO has not estimated the discretionary costs of implementing the bill. The bill contains no intergovernmental or private-sector mandates as defined in the Unfunded Mandates Reform Act.