The beleaguered coal industry could soon find itself in even more trouble thanks to a proposed levy on Chinese ships.

The Trump administration has drafted an executive order to levy fines of up to $1.5 million per port call on Chinese-built ships calling at U.S. ports.

According to the American Petroleum Institute, the proposed fees could also make it harder for the U.S. to export oil, liquefied natural gas, and refined fuels.