month-old faith langford. it's believed her mom cristina hid her baby's car seat just before she was gunned down. faith was found 11 hours aftere the massacre. her relatives. >> it was an attack on innocent families. >> reporter: there is nothing but shock and heartbreak. >> i think a lot of us are just speechless. it's horrific. it just seems like a bad dream. >> reporter: cbs news has learned that relatives have gathered in tucson tonight as the children are treated for gunshot wounds and the families plan nine funerals. all of the survivors were children, all of them are now without mothers. norah? >> o'donnell: janet, thank you. house democrats want to hear from acting white house chief of staff mick mulvaney. he's the highest-ranking white house official investigators have called on. today they sent a letter seeking his testimony in the impeachment inquiry, but nobody is counting on him to appear. meanwhile, we learned today what