An 18-year-old gunman opened fire Tuesday at a Texas elementary school, killing at least 19 children as he went from classroom to classroom, officials said, in the deadliest school shooting in nearly a decade and the latest gruesome moment for a country scarred by a string of massacres. The attacker was killed by law enforcement. Clayton Neville covers this tragic story for us.

Gov. Brian Kemp of Georgia easily dispatched Donald Trump’s hand-picked challenger on Tuesday in a Republican primary that demonstrated the limits of the former president and his conspiracy-fueled politics in a critical swing state. John Stolnis has the story on that, plus we'll go through other primary results from Tuesday.