Mr. Trump won the GOP nomination by tossing red meat to the right-wing of the Party.  The zealots absolutely loved him....finally a candidate who was as extreme as they were.

However, it seem that he's realized there simply aren't enough of those zealots to win the general election.  So, presto, he now changes his stance on immigration to mirror that of Ms Clinton.  Does he really think people will believe he had an epiphany and now truly believes in a more humane approach to the issues with immigration?  I rather doubt it.  Instead, he's told his extrremist base..."hey, folks, I'm willing to sell you out to improve my chances to be elected."  

I've suggested Trump acts like a sociopath.  Here's further evidence.  Values? Integrity? Deeply held beliefs?  Sorry, not applicable.  Instead, egocentric pragmatism...whatever "works".

You euphemistically call it "flexibility", and note it is typical of the way he "made deals"...You're right, he screwed the people he did business with too.