NBC Nightly News (1970- )

The search for 45-year-old Michael Brown, the suspect accused of shooting and killing four people at a Montana bar, intensified on Sunday as authorities revealed the victims' identities. NBC News' Kathy Park has the latest. Air quality alerts from Canadian wildfire smoke spread to the Northeast on Sunday, stretching as far as northern Maine. It comes as dry conditions fuel several wildfires out west, including the Gifford Fire, which grew to roughly 40,000 acres so far. NBC News' Maggie Vespa has the latest. President Trump's new import taxes on multiple countries, including Canada and Brazil, are set to take effect this week, with consumers and small businesses in the U.S. now bracing to pay higher prices for goods and services. NBC News' Dana Griffin has more. President Trump's U.S. Special Envoy Steve Witkoff is set to visit Russia this week after the president issued an ultimatum for Russian President Putin, with the goal of achieving a ceasefire agreement for the war in Ukraine by Friday. NBC News' Vaughn Hillyard reports. As the war in Ukraine rages on, drones have become an important weapon for both Ukraine and Russia. Now, the U.S. Army is testing their own drones to prepare for the future of warfare. NBC News' Courtney Kube traveled to Poland for an inside look. In a move to counter Republican redistricting in Texas, dozens of Democrats in the state House of Representatives are heading to Illinois on Sunday to deny a necessary quorum for the GOP to move forward with those efforts to add more Republican House seats in Congress. NBC News' Ryan Chandler has the latest. As millions of children across the country prepare to go back to school, cases of the highly contagious whooping cough are spreading rapidly. It comes as new data from the CDC reveals that a record number of children got vaccine exemptions for school. NBC News' Maya Eaglin has more.  Pope Leo XIV celebrated mass on Sunday with more than 1 million young Catholics from around the world, marking the biggest event for the pontiff since he was elected. NBC News' Claudio Lavanga reports from Rome. At Lehigh Valley Hospital in Pennsylvania, a group of eight "float" nurses, who float across different emergency departments, built a strong bond and support system after they all became pregnant within months of each other. NBC News' Hallie Jackson has the story.