NPR covers diplomatic progress toward reopening the Strait of Hormuz, with Iran and Oman nearing a deal contingent on US sanctions. In US politics, Michigan’s Democratic primary tests the progressive wing, while Trump campaigns in Las Vegas. Health news includes potential FDA approval for Moderna’s mRNA flu vaccine and food safety alerts regarding Chipotle and lettuce. Additionally, McDonald’s reports slowed sales due to operational missteps, and wildfires burn near Athens.