Panamanian President José Raúl Mulino on Thursday denied the U.S. State Department’s claim that his country had reached a deal allowing U.S. warships to transit the Panama Canal for free. Mulino said he had told U.

The Panamanian leader says he was “incredibly surprised” by the statement, as President Trump threatens a U.S. takeover of the strategic waterway.

Navy use of the canal is infrequent, with about 40 vessels transiting annually, excluding the service’s aircraft carriers, which are too large. Allowing free access would reportedly save the U.S. about $13 million each year, according to the WSJ report.