source: The world -- the world changed on a terrible September morning. And since that day, we changed the world. This will not happen on my watch. # I am seriously committed to save America.
target: The world -- the world changed on a terrible September morning. And since that day, we changed the world. This will not happen on my watch. And since If I saved America from tragedy in these years, my commitment to save America from tragedy in the following years is reliable. I am seriously committed to save America.