President Trump drops a one-liner to reporters aboard Air Force One while explaining why the U.S. is stepping up to help Japan, as its economy grapples with a w

President Trump drops a one-liner to reporters aboard Air Force One while explaining why the U.S. is stepping up to help Japan, as its economy grapples with a weakening yen: "Japan's been very good to us with the exception, of course, of Pearl Harbor." [▻](https://video.twimg.com/amplify_video/20…