My thought was that W has little standing after bringing Karl Rove into the mix.  Bush's brain built the railroad for Trump's politics of the other with Trump and Bannon just running their train down the tracks already there.  I will grant that W did a good job after 9/11 working to prevent blaming Muslims as a group for the work of terrorists and that Bush had respect for immigrants but they made hay on defining the Democrats as The Other and Trump just put it on steroids.  "I knew the gun was loaded but I didn't think he'd kill".