What is fascinating is that Trump is posturing to put an end to deal that appears to be working while simulataneously signalling he will make a deal with North Korea on denuclearization. So, Trump does not trust Iran even though it has agreed to intrusive inspections, etc.... but he does trust North Korea?
I think that Trump just has so much hatred for Obama that he wants to reverse everything that Obama did.
Trump has never trusted the Iranian regime, irrespective of Obama.