WASHINGTON (AP) — From cancer to addiction, doctors and patient groups are warning that the latest Republican health care bill would gut hard-won protections for people with pre-existing medical conditions. Some GOP moderates who may seal the legislation's fate are echoing those concerns.

In a strongly worded statement this week, the American Medical Association said the Republican protections "may be illusory." The American Cancer Society Cancer Action Network said the plan could take the nation back to a "patchwork system" that pushes costs on people with life-threatening conditions.

Such st...