6 AM ET: Global heatwaves, Maryland's GOP primary, canceled mid-air & more

In this episode we look at the heatwaves scorching large chunks of the northern hemisphere. In the US, Republicans in Maryland have selected a Trump-backed election-denier to be their candidate for the midterms. The National Archives has asked the Secret Service to carry out an internal investigation into missing text messages that may have been deleted. In international news - Sri Lanka has a new president today. And finally, air-travel chaos gets taken up a notch.  To learn more about how CNN protects listener privacy, visit cnn.com/privacy