"This is in our national interest and it needs to be solved," Rubio said. Greenland's prime minister has repeatedly said the island is not for sale.

The secretary of State said purchasing the Danish territory is important to the country’s national interests in the Arctic.

Secretary of State Marco Rubio called President Trump's desire to buy Greenland in the "the national interest" of the U.S. during an interview Thursday. The big picture: Trump has doubled down on his push for Greenland since winning the presidential election,