mike barnicle and john meachum and eugene robinson are all still with us.t with the headlines. and then we have donald trump joining us live. president obama will face all the lingering questions about the iran nuclear deal when he holds a news conference today in the east room of the white house. news of the agreement set off celebrations in the capital tehran. iranians spilled into the streets chanting freedom. they lift manufactured the sanctions in exchange for scaling back the nuclear program. president obama says the nuclear component is not built on trust but on verification by inspections. the president explained what he calls a modest goal for relations with iran and why some critics are wrong. in an interview with "new york times" columnist thomas friedman, he defended the deal. >> with respect to iran it is a great civilization. it also has a authoritarian theocracy in charge that is anti-american, anti-israel, anti-semitic and sponsors terrorism and there are profound differences we have between them. and so initially we have a much more modest