The Trump administration is cracking down on noncitizens receiving Medicaid and Children’s Health Insurance Program benefits, according to an announcement by the Centers for Medicare and Medicaid Services.

The center launched an oversight program on Tuesday, in collaboration with the U.S. Department of Homeland Security, to provide states with reports of individuals enrolled in Medicaid who do not appear on federal databases.

“We are tightening oversight of enrollment to safeguard taxpayer dollars and guarantee that these vital programs serve only those who are truly eligible under the law,” said Robert F. Kennedy Jr., secretary of the U.S. Department of Health and Human Services.

States are required to review the federal reports, identify immigration status discrepancies, request information and enforce noncitizen eligibility rules.

Federal law typically does not allow noncitizens to enroll in Medicaid. However, 1.4 million people are enrolled in Medicaid who do not meet citizenship and immigration status requirements, according to data from the Congressional Budget Office.

Some states, like California, Oregon and Colorado have extended Medicaid eligibility to undocumented immigrants, which accounts for the large number of recipients. It is unclear how cooperation will go between states who have expanded Medicaid enrollment.

“Every dollar misspent is a dollar taken away from an eligible, vulnerable individual in need of Medicaid,” said CMS administrator Mehmet Oz.

The One Big Beautiful Bill Act, signed into law July 4, implemented tighter restrictions on Medicaid eligibility including a crackdown on work requirements for able-bodied adults, frequent eligibility redeterminations and increased restrictions on noncitizens.

The move from the health department comes as the Trump administration has worked to share more data on individuals enrolled in Medicaid. The health department first gave Immigration and Customs Enforcement access to enrollment records for individuals on Medicaid in June.

Twenty states, including California, Colorado and New York, filed a lawsuit against the department in July. A federal judge temporarily blocked the health agency from sharing information in those states last week.

“Using CMS data for immigration enforcement threatens to significantly disrupt the operation of Medicaid—a program that Congress has deemed critical for the provision of health coverage to the nation’s most vulnerable residents,” Judge Vince Chhabria wrote in the order.