Months of careful work by the Obama administration for that deal, and bit by bit, Iran had started to become more moderate, too. It allowed international observers and IAEA inspectors to check things out from up close in addition to spy satellites and intelligence agencies.
And then Mr. Orange guy comes along and tears it up for the sole reason that he wanted to look “tough.”
Except that unilaterally ripping apart your contract and demanding that the other side gives you more concessions, well, apparently it works out exactly like one might expect it to. Truly “the Art of the Deal”, real “master negotiator” stuff.