Democratic Rep. Raul Ruiz criticized the Trump administration’s policy of refusing to administer flu vaccines to immigrants Wednesday, as most migrants receive flu shots well after they have started showing symptoms or are already sick.

The California congressman asked in an Energy and Commerce Committee hearing on flu preparedness if U.S. Customs and Border Protection’s refusal to vaccinate people before they are transferred, to either Immigration and Customs Enforcement or the Health and Human Services Office of Refugee Resettlement, allows people to get sick, when the agency could be preventing the illness by vaccinating migrants immediately after arrest.