While some countries shrug off Trump's threats, Panama appears to be taking him quite seriously.

Donald Trump has said that the U.S. could demand the return of the Panama Canal if the country fails to reduce the fees it charges American ships.

Trump again having designs on Greenland comes after the president-elect suggested over the weekend that the U.S. could retake control of the Panama Canal if something isn't done to ease rising shipping costs required for using the waterway linking the Atlantic and Pacific oceans.