President-elect Donald Trump isn't ruling out using military force in an effort to gain control of Greenland and retake control of the Panama Canal. During a Tuesday press conference, Trump was asked if he'd assure the world that he wouldn't use military or economic coercion to secure the sovereign territory and the vital waterway, respectively. The president-elect in his response reinforced the critical economic importance that he sees in Greenland and the Panama Canal. "I can't assure you," he said. "I'm not going to commit to that. It might be that you'll have to do something." "We need Greenland for...