saif al-islam gaddafi is currently being held by militia who is refusing to surrender him to the current government. today secretary of state john kerry implored member of congress to support the nuclear deal reached with iran. he defended the commitment before the house affairs committee and joined by the secretary of state of energy and the treasury secretary. kerry said scrapping the deal would mean a nuclear armed iran. secretary kerry: let me underscore the alternative to deal we have reached is not some kind of unicorn fantasy that contemplates iran complete capitulation. leon: kerry tried to convince republicans and skeptical democrats that the agreement is based on verification and not trust. congress has until september 17 to either endorse or reject the deal. maureen: two in names appear. they were added to the memorial this weekend. medina and hugg s died in a helicopter crash in earthquake relief mission in nepal. hall of heroes recognize those in the communication field who died serving their country. leon: coming up new at 6:00. just what the montgomery county leaders plan

death by shooting for gaddafi's son saif al-islam. huge fines and lesser sentences for others.or were acquitted. the power goes off as the verdict is red. there are constant power cuts. one of the accused has a seizure wrought on by stress. -- brought on our stress. another events his anger at the judges. we were not allowed to film him. this has been a next ordinary and and extorting a -- to an extraordinary try to -- this has been an extraordinary into an extraordinary trial. it will add another question mark to the way the trial is being conducted. the defense lawyers were angry at the harsh sentences. one of them told us that he would appeal. international criminal court has criticized the trial here, but the chief prosecutor insisted that it has been fair. >> the proceedings were opened everyone. john: when i met sarif in his heyday he was quoted by politicians. he was the favorite son of a rich dictator. he was given the suspect doctorate by the london school of economics. at home he was loathed. when he was caught after his father's downfall he was terrified. the people

death sentence on muammar gaddafi pass most prominent son, site eval islam -- site eval islam -- saif al-islam. barack obama is set to shortly become the first ever u.s. president to address the african union. a short tour of the region is in focus on security and human rights. he is now in the ethiopian capital. we have seen those images in the last half-hour of the main african union building there making a speech to the unit. he has already praised many in the fight against terror. expressing real concern about democratic and human rights. one of the issues obama has been addressing is the civil war and south sudan. tens of thousands have been killed in the conflict area it is hoped the two sides will agree to a peace deal by mid-august, but the rebel leader has told france 24 there are some issues to be resolved. our correspondent has this report. >> calling for a breakthrough in the peace efforts, barack obama underlined the urgency of the situation in south sudan. speaking in addis ababa, he thanked the african union and the radio -- and the mediation force. president obama: the situatio

saif al-islam gadhafi was convicted of war crimes committed during the 2011 uprising that forced his father out of office. gadhafi's son was not in the courtroom when the ruling was handed down. he's been held for four years by a militia in western libya that has refused to hand him over. >> ifill: back in this country, an upstate new york prison worker pleaded guilty today to helping two killers escape. joyce mitchell wept as she entered her plea today in plattsburgh. the former prison tailor admitted to smuggling hacksaw blades and other tools to the men inside frozen hamburger meat. richard matt and david sweat's daring prison break last month triggered a three-week manhunt. mitchell could face up to seven years in prison. her sentencing is set for late september. >> woodruff: more than a thousand scientists and tech experts warned today of the danger of an artificial intelligence arms race. in a open letter, the signatories called for a ban on autonomous weapons that are beyond meaningful human control. technology could make robots on battlefields a reality within years, not deca