This is not a joke,” Rubio said “The Megyn Kelly Show" on SiriusXM. "This is in our national interest and it needs to be solved.”

Kelly asked Rubio if the U.S. will own Greenland — whose ruling party actually wants the island to be independent — by the end of Trump’s second term. “We’ll see,” he replied, adding that Americans can “rest assured” that U.S. interests in Greenland, the Panama Canal and elsewhere will be “more secure” by that time.