Federal health officials are casting doubt on a funding scheme by California to keep nearly 700,000 children from being yanked from a government health insurance program for the working poor. U.S. health officials said the plan adopted by the state in the final days of the legislative session and signed into law by Gov. Arnold Schwarzenegger may not meet regulatory muster, the Los Angeles Times repors. As a result, children's health advocates are warning that by the end of 2010, hundreds of thousands of children could lose their health insurance.