That’s Trump’s point to argue, the fact is that Cruz was openly against deportations and even continues to make no mention of deporting non-criminal illegals from his website.
Cruz also flipflopped on TPP. Cruz also took Rand Paul’s side against nsa spying and isolationism, while Reagan supported nsa spying and was an interventionist.
Trump’s core issues, are trade, the border, and terrorism, going back to his 2000 book, ‘The America We Deserve’; he’s solid on those issues.
Cruz has recently adopted a Romney like posture on illegal immigrants which amounts to robust enforcement of laws concerning employment and benefits, strict enforcement on the border, and forced deportation according to the law, reversal of his position on H1B visas etc.
It appears that there is virtually no difference today between Cruz' position on illegal immigrants and Trump's except Cruz does not say he would let them back in, but Trump would.