It's easy for Trump to change his positions since he never has really believed anything beyond his own greatness. He suckered so many people by merely acting the way a liberal (the closest to his real worldview) thinks a conservative is. He played at caricatures of conservatism, though he never understood or learned why conservatives say or believe what they say and believe. He is the greatest mountebank and fraud to sucker a whole political party in the history of the USA.