Trump signed a deal to help Saudi Arabia build a civilian nuclear program, then a day later reversed himself and made it depend on Saudi Arabia making peace with Israel — a flip that shows how much sway Israel holds over US policy.

• The US offered the Saudis nuclear technology with only American inspections, not the tougher international ones — the same technology it's trying to stop Iran from having.
• Started under Biden, who wanted the Saudis tied to the US and away from China, the deal could give Saudi Arabia a path to a nuclear bomb.
• A day after signing, Trump abruptly added a new condition on social media without even calling the Saudis, likely after pushback from Netanyahu and pro-Israel groups.
• Israel's real fear is the nuclear part, not Saudi security guarantees — and since Israel can now annex Palestinian land with US backing anyway, it has little reason to deal.
• The reversal signals that even Trump's signed agreements can't be trusted, though money — Saudi cash and Westinghouse reactor sales — may keep it alive.

Outlook: The deal is now in doubt and may stall over Israel's objections, though financial interests could push some version of it forward.