Heavy smoke from wildfires blazing in Canada and Minnesota is engulfing large swaths of the Midwest and Northeast U.S. this week, impacting air quality as millions of people are exposed to hazardous levels of air pollution.  A bird strike most likely caused the helicopter crash in the Hudson River that killed six people near New York City last year, according to a National Transportation Safety Board report released Thursday.  President Trump's speech tonight is expected to touch on previously unreported alleged Chinese meddling in U.S. elections, according to sources familiar with the matter.