A long sliver of federal land along the U.S.-Mexico border that President Donald Trump is turning over to the Department of Defense would be controlled by the Army as part of a base, which could allow troops to detain any trespassers, including migrants, U.S. officials told The Associated Press.

The transfer of that border zone to military control — and making it part of an Army installation — is an attempt by the Trump administration to get around a federal law that prohibits U.S. troops from being used in domestic law enforcement on American soil.

The officials said the issue is still under review in the Pentagon, but even as any legal review goes on, the administration’s intent is to have troops detain migrants at the border.

Troops are prohibited from conducting civilian law enforcement on U.S. soil under the Posse Comitatus Act. An exception known as the military purpose doctrine allows it in some cases — but would not apply here and would likely be challenged in the courts, said Elizabeth Gotein, an expert on presidential emergency powers at the Brennan Center for Justice.