Meet the Press NOW — April 7

President Trump's warns “a whole civilization will die tonight” unless Iran meets his deadline to make a deal and reopen the Strait of Hormuz. NBC News Chief Data Analyst Steve Kornacki previews the elections in Wisconsin and Georgia as voters head to the polls. NBC News Capitol Hill Correspondent Mel Zanona speaks with Sen. Bill Cassidy (R-La.) about a primary challenge from Rep. Julia Letlow (R-La.), who has President Trump's endorsement.