Americans are drinking less wine, but growers say there’s another reason demand is down for California grapes. It’s a law that allows U.S. wineries to include cheaper imported wines in products labeled as American. On Tuesday, the State Senate will vote on a bill sponsored by California grape growers that aims to close that international blending loophole. Reporter: Tina Caputo California is suing the Trump administration over its latest attempt to undo Clean Air Act waivers, which govern many of the state's auto emission standards. Learn more about your ad choices. Visit megaphone.fm/adchoices