>> and white house press secretary josh earnest today in fact played up the role of congress in having to approve lifting of the toughest sanctions on iran if there is a deal, shep. >> the financial markets are watching this closely and they're doing very well today. >> yes. and the price of oil in particular is what traders have their eye on. it is falling again today in part on expectations that a deal could increase supplies of iranian oil on the world market. us west texas crude was down today about another dollar a barrel to $44. in fact the iranian oil minister today said that iran is ready to increase oil exports by up to a million barrels per day if sanctions are lifted. >> peter barnes in washington, thank you. new accusation this islamic state is using chemical weapons during its bloody terror campaign. a top commander says isis fighters have used chlorine gas