Democrats have been calling for an investigation into whether Price may have violated federal laws designed to stop members of Congress from engaging in insider trading thanks to his track record of buying and selling shares in health care companies while taking actions on Capitol Hill that could boost their profits. Over the past four years, Price, a former orthopedic surgeon who is deeply involved with health care policy, traded more than $300,000 of shares in medical companies, raising serious questions about conflicts of interest. In one case, reported by CNN, he invested in medical device manufacturer Zimmer Biomet less than a week before introducing a bill that would have benefited the company by delaying new regulation detrimental to its business.