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.

Donald Trump's surprise threat to retake control of the Panama Canal and his expansionist declaration that the United States should own Greenland signals that the incoming U.S. president will pursue a foreign policy unbound by diplomatic niceties.