Man, 75, in serious but stable condition after being knocked to ground by Buffalo police

05:25

A 75-year-old man is said to be in serious but stable condition after a bystander filmed police in Buffalo, N.Y. shoving him to the ground. Erie County Executive Mark Poloncarz says officers involved have been suspended. "We're all disgusted, we're disappointed," Poloncarz told Lawrence O'Donnell.