U.S. President-elect Donald Trump on Tuesday would not rule out the use of military or economic coercion in resolving his concerns surrounding the Panama Canal and Greenland. Asked at a news conference if he could assure the world he would not use military or economic coercion in trying to get control of those areas, Trump responded: "I can't assure you -you're talking about Panama and Greenland. No, I can't assure you on either of those two, But I can say this, we need them for economic security."