But, in a recent statement, the GOP party chairman said if Trump falls just one vote short (1236) that he will not be the nominee.
As this ND guy pointed out, there are a lot of rules-games that can be played with even so called bound/committed delegates to unbound & uncommit them.
Of course, the hope is that in the meantime, Donald will do or say something that will ruin his campaign. Which is a distinct possibility.