Let me get this straight:
Mexicans sneak in looking for work...he wants sanctuary cities to protect them from federal law, so they don’t have to return.
Cubans fleeing tyranny...he has now changed federal law, to force them to return to certain imprisonment (at best).
Bingo! You got it!
Cubans have been long-time critics of Castro and and were strong in their support of Trump. That makes them unwelcome in Obama’s America, unlike border jumpers.