12 PM ET: A letter from Trump, UK turmoil, young cancer epidemic & more

Former President Donald Trump has sent a letter to the January 6 House Select Committee after it decided to subpoena him. A teenage suspect has been arrested in connection with a mass shooting in North Carolina. UK Prime Minister Liz Truss has fired her finance minister and pivoted on her much-criticized economic policies. US Senate candidates in Georgia are squaring off in a debate tonight, while the spotlight remains fixed on their private lives. Plus, a new study finds a worrying trend in cancer cases.To learn more about how CNN protects listener privacy, visit cnn.com/privacy