The U.S. government plans to continue collecting tariff revenues and pursuing its immigration crackdown in the event of a shutdown, according to the Department of Homeland Security.

With government funding set to expire after Sept. 30 unless Congress acts, federal agencies are updating their operational plans in the event of a shutdown.

DHS said that most of its security and revenue operations will be considered essential, according to a document dated Sept. 19 and posted Saturday on its website.

The Trump administration has dramatically increased tariffs on a wide range of U.S. imports and touted the revenue as a key tool for making a dent in the federal budget deficit. The agency’s planning document says that U.S. Customs and Border Protection will continue revenue collections under a funding lapse.

The agency, which houses Immigration and Customs Enforcement, is also at the center of the Trump administration’s stepped-up immigration enforcement, all of which is set to continue whether or not a stopgap spending measure is passed.

Under the planning document, nearly 258,000 of DHS’s 272,000 employees will be classified as essential. That’s a higher number than under planning documents the department issued a year ago, when it had 7,000 fewer employees.

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