WATCH: Jon Stewart Slams Republican Senators for Letter to Iran

'We’re f**king cuckoo! Cuckoo bananas!' Daily Show host says of GOP Senators.

The open letter to Iran's leaders, signed by 47 Republican senators, sparked a political firestorm. In the letter, the Republicans told Iran's leaders any nuclear deal with Obama could last only while he remains in office.

World powers and Iran are trying to reach a framework agreement this month and a final deal by June to curb Iran's nuclear program in exchange for easing sanctions. Iran says the program is for peaceful purposes only.


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