Jackie Evancho, 16, and her sister Juliet Evancho, 18, tell "GMA" the message they hope to send to Donald Trump in the wake of his administration's order to roll back protections for transgender students.SUBSCRIBE to ABC NEWS: https://www.youtube.com/ABCNews/ Watch More on http://abcnews.go.com/ LIKE ABC News on FACEBOOKhttps://www.facebook.com/abcnews FOLLOW ABC News on TWITTER:https://twitter.com/abc GOOD MORNING AMERICA'S HOMEPAGE:https://gma.yahoo.com/