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.

President-elect Trump has revived calls for the United States to buy Greenland and complains of high fees at the Panama Canal. Some experts say his words hark back to an aggressive style he used in business.