A Republican's blunt criticism of Israel is framed as a chance for Democrats to take a tougher, more independent line on US foreign policy.

• JD Vance said Israel can't solve every national security problem by killing its way out, rare public criticism from a top US politician.
• The argument: both US parties are too tied to Israeli interests and put American voters second.
• Democrats are urged to seize this opening by being more populist and pro-peace to win popularity.
• The claim is that this kind of frank talk gets a strong, positive public reaction.

Outlook: Expect more pressure on both parties to rethink how closely US policy follows Israel's lead.