Former president Bill Clinton will be the keynote speaker at a conference of health-insurance executives this week. America's Health Insurance Plans, the largest health-insurance provider trade group in the country, is holding its Institute 2015 conference in Nashville this week. Clinton, whose wife Hillary is running for president, will close out the conference Friday afternoon with his address to attendees. "The session is open to Institute attendees (who have registered and paid for the entire Institute) and Friday only registrants," says the conference's website. "No press allowed."