NPR News Now covers the Republican midterm convention in Dallas, where Senator Ted Cruz and President Trump aim to unify the party ahead of November elections. The broadcast also details the New Hampshire Senate race between John Sununu and Chris Pappas, noting smooth polling operations despite federal observers. Additionally, the segment reports on new US retaliatory tariffs against Canada, OpenAI’s claim of solving the Navier-Stokes problem, and the aftermath of Hurricane Lowell in Hawaii, before concluding with the NFL season opener.