The Republicans can't drop Him from the Nomination race, he would just run as an Independent & take a massive % of Republican voters with Him.

The Repub party & Trump know this

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Conspiracy ALERT

Could he be assassinated ? 

If he is, maybe looking at His enemies, would be the totally opposite direction to look in

Him being killed may be the only way, His party can Win

Him being killed by a 'Muslim' no mater how tenuous a link to that Religion, would be a Win Win