It's not just US, most of the European powers now believe on Israel's cause.

French Foreign Minister claimed Iran's nuclear program is an existential threat to Israel and Europe.
https://www.timesofisrael.com/liveblog_entry/french-fm-says-irans-nuclear-program-is-an-existential-threat-to-israel-and-the-region-urges-diplomatic-solution/
https://english.alarabiya.net/News/world/2025/06/15/iran-nuclear-program-is-a-threat-for-israel-and-europe-says-french-foreign-minister-

UK is moving Fighter Jets to Middle east to defend Israel, Chancellor claims UK military could potentially be used to defend.
https://news.sky.com/story/uk-military-could-potentially-be-used-to-defend-israel-chancellor-tells-sky-news-13383945
https://www.reuters.com/business/media-telecom/britains-finance-minister-signals-possible-support-israel-iran-conflict-2025-06-15/