mass shootings. our cbs news investigation the uvalde gunman bragged to friends about getting an assault rifle after his 18th birthday. are gun manufacturers marketing military-grade weapons to at-risk young men? american adversaries united. vladimir putin meets with the iranian leader, after iran promises drones to russia. plus, great news for those toys r us kids. and, america s favorite pastime, honoring a member of america s greatest generation. this is the cbs evening news with norah o donnell, reporting from the nation s capital. o donnell: good evening to our viewers in the west and thank you for joining us on this very warm tuesday night. tonight, the heat is on across much of the country as the scorching hot summer grips the nation. brutal and dangerous temperatures are being felt from california to massachusetts. more than 120 million americans are under excessive heat warnings or advisories, with triple-digit temperatures expected from the great plains to th