A viral but unverified claim that the US may be days away from a nuclear strike on Iran is almost certainly false, but it surfaces a real and alarming trend toward making nuclear weapons easier to use in regional wars.

• The claim comes from a commentator with a long history of spreading fabrications, and he has offered zero evidence to back it up.
• The story centers on Pickax Mountain, a deeply buried Iranian nuclear site that current American bunker-buster bombs likely cannot destroy, fueling speculation that only a nuclear weapon could finish the job.
• More credible reporting suggests the real plan is a resumption of conventional airstrikes on Iran soon after the US midterm elections, pushed by Israel's Prime Minister as he fights to hold onto power.
• The Pentagon has separately been working on new rules that would make smaller "tactical" nuclear weapons easier to use in wars like this one, a trend that makes the nuclear rumor harder to fully dismiss.
• If any country used a nuclear weapon for the first time since 1945, the global taboo against nuclear use would collapse, likely pushing Russia, North Korea, Israel, India, and Pakistan to feel freer to use their own.

Outlook: A new round of conventional US and Israeli strikes on Iran looks likely in the coming weeks, while a nuclear strike remains unconfirmed and still highly unlikely.