to say there is no causal relationship is inaccurate. >> brown: very briefly, heather macdonald, what do you think about the federal role? >> it's unnecessary here. there's no sign of a pattern or practice of civil rights violations in this case. it's... there's simply not any kind of legal case for causation here on the part of officer encina or the police department or highway patrol from which he comes. again, everyone wants to protect plaque lives, and the best way to do that is for policeing to try to protect the community from gun violence. >> brown: all right. >> the best way to do that is to acknowledge what we live with every single day. >> brown: brittany packnett, heather macdonald, thank you both very much. >> thank you. >> woodruff: stay with us. coming up on the newshour, a drug that's prompted a record number of calls to poison control; the n.f.l. player who gave up his career because of concussions; and why musician lera lynn sings about the darker side of things. but first, as the year comes to an end, we thought it would be a good idea to take stock and look back at

trish: heather macdonald, thank you so much. >> thank you, trish. trish: coming up the race for the white house is getting nasty. why donald trump is going for bill clinton calling him fair game after hillary accused the billionaire of sexism. and why she says -- or why he says she's playing the gender card. that's next. >> yeah, i think he is fair game, because his presidency was really considered to be very troubled, to put it mildly, because of all of the things that she's talking to me ant. i mean, she's mentioning sexism. he'll come under attack from many other people. trish: all right. donald trump didn't stop there though. this morning he was out tweeting, quote: if hillary thinks she can unleash her husband with his terrible record of women abuse while playing the women's card on me, she's wrong. is bill clinton fair game? former bush deputy assistant brad blakeman thinks so. leslie marshall has a view as well. good to have you here, welcome, good to see you. leslie, this could get interesting. i mean, you could have a situation where they k