NPR News Now covers multiple developing stories, including calls for an independent investigation into the fatal shooting of a Mexican immigrant by ICE agents in Houston. In Maine, Graham Plattner formally withdraws from the U.S. Senate race following rape accusations, while a scorching heat dome prompts emergency aid efforts in Colorado. Additionally, President Trump refuses to sign a bipartisan housing bill, a suspect is arrested in the UK for killing former MP Anne Widcombe, and PEN America’s president resigns over controversy regarding boycotts.