Trump has made a mistake in accurately blaming Bush for 9/11.
Byron York: “This weekend was an inflection point in the Republican presidential race — a moment in which some significant part of the GOP establishment came out of denial and realized Donald Trump might well become their party’s nominee. That doesn’t mean Republicans have made their peace with a Trump victory. On the contrary — some are preparing to do whatever it takes to bring him down. Which could lead to an extraordinary scenario in which GOP stalwarts go to war to destroy their own party’s likely nominee.”
To take Trump down, you have to destroy the Republican base. The racist arrogant know nothing base of the GOP will have to be surgically removed from the party. That will lead to a collapse in the party's electoral fortunes, but it is necessary. You cut cancer out. You don't try to change cancer. You kill it.