I suppose he can always back down on the back down.
Promised a wall
If he signs the McConnell bill to keep gubment open to February 2019 he will have backed down on is promise cuz there is ZILCH money for wall in bill
So to be a man of his word he needs to refuse to sign the bill...shut down the gubment and sit and tweet and eat till the cows come home or he gets sleepy and dozes off.