Trump is expected to announce this week, probably Thursday, that he will “decertify” the deal and state that it is not in the national interest of the United States. This action alone would not derail the deal, however. Rather, it would fall to Congress to decide whether to reimpose sanctions against Iran, which would constitute a break from the pact.People briefed on Trump’s intentions previewed them to The Washington Post last week, although White House officials have cautioned that Trump’s plans could change and that his decision is not final until he announces it.

“We’re now stuck in this bad deal, and I think he’s trying to respond measuredly,” said Barry Bennett, a former Trump campaign adviser. “A lot of things require congressional approval, so when he does things like this that his base wants him to do and Congress sits on it for a while, it’s why their approval rating is down.”

To Trump’s supporters, Brinkley posited, it may not matter whether Congress reimposes sanctions derailing the Iran deal. The word they will hear the president utter is “decertify.”

“All his base knows is that he said Obama made the worst deal in history on Iran,” Brinkley said. “Fewer people follow the minutiae of that deal. So he gets known to be the guy who dislikes Obama’s deal, even though the deal may stick.”

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