jonathan franzen on his new novel, "purity." president obama is one senate vote away from clinching the iran nuclear deal. opponents need 67 votes to block the nuclear agreement-- that's enough votes to override an expected presidential veto. to win out, the president, therefore needs 34 votes. today his total reached 33, thanks to the support of two senate democrats, chris coons of delaware and bob casey of pennsylvania. the controversial accord aims to restrict iran's nuclear program in exchange for the lifting of economic sanctions. senator casey joins us now from capitol hill. senator casey, thank you for being here. this deal has been the subject of millions of dollars worth of negative advertising, a lobbying campaign. you've spent a lot of months looking at it. why the decision to support it? >> well, judy, fundamentally, the decision was because you have to decide up or down on this agreement as it relates to the basic question of how do we stop iran from developing a nuclear weapon. short term and long term. short term

the inmate he fought, erik franzen, will also go before the disciplinary committee. but he seems no more concerned now than he was when he casually walked away from the fight as officers swarmed burack. >> what do you think is going to happen? are you worried? >> no, no. >> no? >> prison officials claim that erik franzen is a well behaved inmate and it's only his violent reputation outside of prison that requires them to house him in section 20. >> with the police he has a very heavy reputation that he's a very heavy guy in the criminal environments. it is a reputation that follows him and he has a lot of crimes and it's often with guns. >> i'm 39 years old. i was before ten years in jail for armed robberies and then i go free and i come back for two years for a fight. and now i'm in jail, they think i killed somebody. >> under what circumstances did this person die? >> bullet in his head. >> you fought that guy? >> yeah. they're scared of him and they put me here. why i would fight an ex-commando? why? they are scared. i know this. i'm here, he's not here, you know?

michele franzen reports. >> reporter: authorities say it was a pressure cooker bomb similar to those used in the boston marathon attacks that the 20-year-old florida suspect knew how to build. that attack in boston two years ago killed three people. the fbi says the suspect was attempting to share bomb building instructions. and is an isis sympathizer. investigators also say the suspect joshua goldberg claims to have inspired the may attack in garland, texas, when two gunmen en stormed an art exhibit. those attackers were shot and killed by a police officer. the fbi and intelligence officials have been warning about how eb isis has been in reaching out and recruiting new followers. especially so-called lone wolves using the internet and social media. and in this case, the suspect allegedly told an fbi informant online line posing an is a radical to set off a boston style pressure cooker bomb at can an sass city's 9/11 memorial but he was arrested in a sting. abc news, new york. >>> agents raided goldberg's home near jacksonville this week. he's charged with distribution of informatio