Marco Rubio supports Donald Trump's plan to buy Greenland and the Panama Canal, citing it as being in the national interest of the US. Denmark and Greenland have firmly rejected the offers, expressing concerns about potential military action. Rubio defended Trump's stance on not ruling out military force to acquire the territories, stating it is a common tactic in business negotiations. He also highlighted the importance of the Arctic region for shipping lanes and expressed concerns about China potentially taking over Greenland if the US doesn't proceed with the deal.