The U.S. Navy has denied Chelsea Clinton permission to campaign for her mother on a former bombing range on a small Puerto Rican island.

Hillary Rodham Clinton’s campaign wanted to use the land Wednesday as a setting to discuss the candidate’s clean up plan for the region and call to give some areas to local residents.

But Navy spokeswoman Lt. Lara Bollinger said no one is allowed to campaign on federal property.

Chelsea Clinton is making her second campaign visit to Puerto Rico in the last three weeks. The U.S. territory has 55 delegates at stake in its June 1 Democratic primary.

The Navy closed the range in Vieques in April 2003 following years of protests after two errant bombs killed a security guard.