john. >> dickerson: ruiz for us in uvalde, texas, thank you. to the nation in the aftermath of today's tragic events, the second time in less than two weeks the president spoke about a mass shooting in america. cbs's nikki battiste is at the white house. nikole, the first thing we could hear was an audible sigh. >> reporter: that's right, john. president biden was emotional with first lady jill biden by his side as he expressed the horror and frustration at the tragedy, saying it's time to turn our pain into action. >> as a nation, we ask when in god's name are we going to do what we all know in our gut needs to be done? i am sick and tired of it. we have to act. and don't tell me we can't have an impact on this carnage. >> reporter: the president's remarks come about an hour after he returned from an overseas trip to asia. while he was aboard air force one, he called texas governor greg abbott and offered any and all assistance to deal with this horrific shooting. flags at the white house have been lowered to half staff. john. >> dickerson: ni