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    'Crunch time' in Iran nuclear showdown

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'Crunch time' in Iran nuclear showdown

The deadline is looming for a nuclear deal with Iran but there's a fresh fallout over a warning letter from GOP to Iran's leaders. CNN's Jim Acosta reports.

'Crunch time' in Iran nuclear showdown

The deadline is looming for a nuclear deal with Iran but there's a fresh fallout over a warning letter from GOP to Iran's leaders. CNN's Jim Acosta reports.