Trump can sign off on whatever he wishes. However, in the face of open betrayal by the GOP against him, and considering their open abdication of duty, and their support for Bush and Hillary, Trump is damn free to change his mind, if necessary, and make the people cheer him in so doing.
After all, there is not a shred of enforcement to Rinse’s sheet of paper and we all know it.
Trump supporters know exactly what the GOP are trying to do to his candidacy and to us.
Hope I'm wrong.