Who understands the effectiveness of Obama's nuclear deal with Iran? [View all]

I am having an argument with someone who said that Obama's contract was ineffective because Iran wasn't allowing people into the country to come in to inspect their facilities to see if they were collecting more than the 3% uranium allowed by the agreement. Per Obama, this was how they would be able to determine if Iran was acquiring enough nuclear supplies to build a bomb.

From what I remember, Trump came in and blew up everything that previous presidents (especially Obama) had put together, for no other reason than he's reckless and arrogant.

Anyway, whatever you want to add or correct, please feel free to do.