NPR News Now covers South Carolina Governor McMaster’s expected interim Senate pick following Lindsey Graham’s death, with Trump recommending Graham’s sister. The broadcast reports on escalating US-Iran tensions, including Trump’s threat to block Iranian ships and impose tolls in the Strait of Hormuz. Domestic stories highlight rising grocery costs forcing Americans into debt, a deadly UK heat wave linked to climate change, and the ineffectiveness of federal prison grievance systems. Additional segments discuss EU proposals to ban social media for minors and a brief market update.