Trump saw an opportunity to pander and he took it.
Cruz is my first choice, but taking advantage of an opportunity is not a fault. I think Trump is seeing what socialism and anti-constitutionalism has done to our nation as have many other left leaning citizens. They are prodigal sons and are realizing what conservatives have known all along.
Find out who is advising him now. Trump is loyal to those who are loyal to him. Who are his top campaign managers?