prophetic when these two police officers were gunned down by a suspect who posted on his instagram, you take one of ours, we'll take two of yours. now it was the cop's turn to send a message. this time to the mayor. dozens of officers showing him their backs as he walked into a news conference on the shooting. while the head of the police union suggested this mayor has blood on his hands, which brings us to tonight. clearly these thousands of marchers in the cities across this country have something they're trying to tell us. but so do these cops. and while folks like al sharpton and attorney general eric holder repeatedly say they support our police, their actions to many suggest something else. this has now become more than a political fight with suggestions that public safety is on the line here. we've assembled a powerful lineup of guests for you including former new york governor george pitaki,