https://www.washingtonpost.com/news/post-politics/wp/2016/07/14/as-trump-prepares-to-unveil-vp-pick-republican-delegates-scramble-to-ward-off-rules-revolt/?postshare=7051468549815096&tid=ss_tw"Republicans responsible for setting the party's presidential nomination rules on Thursday overwhelmingly rejected attempts to formally unbind delegates to next week's convention, effectively ending any serious attempt to rob Donald Trump of the GOP presidential nomination."
"The rejection of the "unbinding" proposal was so overwhelming that committee leaders opted not to record the tally."