By BI: They could do this because Trump hasn’t yet ruled out a 3rd party run. However, if the RNC actually pulls such a stunt, it could backfire and push him even higher in the polls and closer to the nomination. Unlike other candidates, Trump doesn’t need financial backing from the RNC, so they can’t hold the power of the purse over his head.

https://youtu.be/tiH_NQ0PfRg