i'm katherine kobayashi in tokyo. u.s. president barack obama has gone on the offensive to speaker suede lawmakers to approve a military strike against syria. he and other members will be challenged to win other members of congress and american public. secretary of state john kerry says government officials have proof a nerve agent was used in the suburbs of damascus. >> we have evidence from hair and blood samples from first responders in east damascus, the people who came to help, we have -- we have signatures of sarin. >> kerry built his case speaking on a number of talk shows. but he did not say whether government officials had proof of whether syrian government or opposition forces were responsible. kerry said president obama has it right to take military action with or without congressional approval. >> this goes to the core of american credibility in foreign policy and i believe the congress of the united states will understand that and do the right thing. >> members of the administration are releasing other informa

i'm katherine kobayashi in tokyo. u.s. president barack obama has gone on the offensive to speaker suede lawmakers to approve a military strike against syria. he and other members will be challenged to win other members of congress and american public. secretary of state john kerry says government