RE: wrong move Ted.
Let’s look at the other picture ... if Ted Cruz is NOT the nominee... will his supporters flock to Trump?
Good question, and I'd suggest that all but a few impossibly stubborn folks, will.
Unless I'm way off base, it appears most Cruz supporters rate immigration at or near the top of issues. IF this is true they have nowhere else to go.
On the other hand, since Cruz has some very real baggage on the topic, it becomes a least worst/who can win decision, and a former Trump supporter has a few options.