As President Donald Trump signals plans to order federal intervention in Chicago, experts say the likely escalation of immigration enforcement operations is setting the stage for a contentious dynamic between local police and federal authorities.

One told Floyd it takes a lot of oxygen to talk, while another told angry bystanders that Floyd was talking, so he can breathe.That reaction -- seen in police restraint deaths around the country -- is dangerously wrong, medical experts say. The ability to speak does not mean the patient is without danger, said Dr. Mariell Jessup, chief science and medical officer of the American Heart Association. In the moments before he died, Floyd told police he couldnt breathe more than 20 times. But the misperception that a talking person is able to breathe has also come up in other high-profile in-custody deaths. The fact that he was able to say it meant he could breathe, said King, the son of a police officer.

Houston Police Chief Art Acevedo says he supports national policing standards. The legislation is the most expansive effort in recent years to address national policing practices at a federal level. "Most departments have not allowed chokeholds for decades," said Joe Gamaldi, national vice president of the Fraternal Order of Police, which represents more than 350,000 US law enforcement officers. A key measure in the legislation -- vehemently opposed by a coalition of law enforcement unions -- will shatter the veil of secrecy that a 1976 law provided police personnel and disciplinary records. The New York state legislation will designate the attorney general as an independent prosecutor in cases involving civilian deaths.