martin matishak will be following all of this. his work is online. thank you for being with us. martin: thanks for having me. >> the university of california berkeley is celebrating the 50th anniversary of the free speech movement on its campus. gabriel stricker discusses twitter's policies and how they impact free speech around the world. it is 50 minutes. >> today it is an absolute the light for me to introduce and welcome gabriel stricker. he is a cal alum. he is chief of communications at twitter, communications officer. we will be welcoming back, not just for this event but he has been helping berkeley think about and celebrate the 50th anniversary of the free speech movement. it is quite important in berkeley this year. his bachelor in arts was in latin american studies. his current role as chief communications officer. he leads the movement for media relations and public policy. he first came to twitter in 2012, stepping into one of the world's highest profile roles in the communications field. he has been credited by many as the driving force behind turning around twitter

martin matishak is following capitol hill for the newspaper. thank you very much for being with us. martin: thank you for having me. >> i want to begin with the house armed services committee. we will hear from ashton carter. we heard last week from john kerry, who has been working on a deal with iran. he has been in switzerland. also we will hear from the chairman of the joint chiefs of staff, general martin dempsey. just how contentious will this hearing the -- be? martin: this could be a contentious hearing for secretary carter and martin dempsey. they were up before the senate on late relations committee. they were up for four hours. it raise more questions than it answered about military force against islamic militants. the house armed services committee is pretty full of veterans that have served in iraq and afghanistan. they will take these officials to the mat and grill them on specific language. >> the white house continues to insist that it can move forward with action against isis without congressional approval. why is it insistent on having authorization for military forc