Trump's face is like placing a Bozo the Clown logo over all republican candidates this Fall. The GOP simply can't risk that. So this rule would facilitate the proper candidate and representative of sober conservative values to promote victories for the GOP in both the Congress and POTUS.
And now it's time for the adults to talk.
The DNC knows that FOX will be live streaming EVERY violent LIB protester outside the convention.
The GOP has hundreds of 'passive' Trump supporters who have been trained just stand there and let the LIB commit violence on them.
EVERY time that is broadcast to the country Hillary loses another 50K Independants to Trump.