Immigration and Customs Enforcement has a new tool at its disposal as the Trump administration cracks down on illegal immigration.

The Transportation Security Administration has been sending airline passenger data to ICE since March, which immigration agents can then use to make arrests at airports. ICE cross-checks those names against its own immigration databases and deploys agents to detain people it says are subject to deportation.

Public reporting does not show TSA screeners running new immigration status checks on everyone at the checkpoint.