1: That , he said , should be  sufficient to take advantage of this once-in-a-lifetime opportunity to see whether or not we can at least take the nuclear issue off the table ,  he said . 2: Obama said even if Iran ca n't be trusted , there 's still a case to be made for the deal . 3: Obama calls the nuclear deal with Iran a  once-in-a-lifetime opportunity 
1: this once-in-a-lifetime opportunity 2: the deal 3: the nuclear deal