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.

Panama denied a claim made by the State Department on Wednesday that the Central American nation had agreed to no longer charge fees for US government ships to transit the country’s famous canal.