Leave your feedback Share Copy URL https://www.pbs.org/newshour/show/pbs-newshour-full-episode-april-21-2016 Email Facebook Twitter LinkedIn Pinterest Tumblr Share on Facebook Share on Twitter Thursday on the News Hour... Thursday on the NewsHour, controversies over rules dominate the day on the campaign trail. Also: Inside the electoral battles for Pennsylvania and Maryland, how trade policy is playing out in the race for the White House, why the U.S.-Saudi relationship is under strain, the fight over a carbon tax in Washington state, the co-founder of AOL offers his vision of the future and looking back on Prince at his best. Listen to the Broadcast Subscribe to the Full Show Podcast Segments From This Episode Can a tax help cut down greenhouse gas pollution? 9 min This online pioneer sees a future where everything is internet 7 min Why trade and globalization concerns are resonating with voters at home 6 min Talk of rules, for restrooms and the RNC, dominates the campaign trail 3 min Watch Prince wail on ‘While My Guitar Gently Weeps’ 1 min News Wrap: Death toll in Ecuador climbs higher 4 min What the Maryland and Pennsylvania primaries can offer the presidential candidates 6 min Why the U.S. relationship with Saudi Arabia is under strain 7 min