President Trump says he’ll act against Iran “with speed and violence,” if he doesn’t get a deal to rein in Iran’s nuclear program.

Host Mary Louise Kelly talks with National Security Corresponent Greg Myre and Science and Security Correspondent Geoff Brumfiel about how, after a month of turmoil, the US and Iran seem to have arrived at talks over Tehran's nuclear capabilities. And they'll unpack how much more dangerous the world is after the expiration of the last U.S.-Russia nuclear weapons treaty.

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