text:  House Democrats have blasted the measure, arguing it would prevent some U.S. citizens from voting if they don't have the proper documents. It's already illegal for non-U.S. citizens to vote in federal elections, and many experts say voting by non-citizens is extremely rare. Windsor Johnston, NPR News, Washington. U.S. stocks are trading higher this hour. The Dow is up 214 points. This is NPR News.