If employers want to reduce US health care spending, why don't they band together and lobby Congress to introduce legislation to reduce health care costs? I ha

If employers want to reduce US health care spending, why don't they band together and lobby Congress to introduce legislation to reduce health care costs? I have a gut feeling it is the insurance companies that set ever increasing rates which drive up costs overall. And then they cover less forcing patients to pay out of pocket for anything more than a flu shot. There are other countries with the same quality services for much cheaper costs. Maybe even better quality. Employers would save more money getting the insurance companies to lower rates (via legislation likely) than trying wellness programs.