As a reminder, this is nothing new for Trump. He is the guy who said that Romney's plan (that everyone complained was amnesty) was too cruel. Even Trump's current stated plan involves touchback amnesty. Of course it should be expected he would shift further left in the general election, after all, he is selling himself to a different audience now. He believes the Right is sold, so he is changing his pitch and moving to the left. Truth to him is subjective to the sale in front of him.