authorizing the use of force against syria is coming together in congress. the senate foreign relations committee will take up a revised authorization bill for the use of force in syria, secretary of state john kerry, defense secretary chuck hagel and joint chiefs chairman martin dempsey go before the house foreign relations committee after taking a grilling in the senate yesterday. russian president vladimir putin tells the ap if, if there is proof syria used poison gas he could then support a u.n.-led strike. very big if. that is a big part of this story going forward. we'll cover it like no other network can, we start with cnn's brianna keilar, she is with the president in stockholm. >> reporter: chris the president's visit to sweden is essential will i a social one. the swedish prime minister, frederick rhinefeld would like to see a diplomatic solution and on thursday and friday when