Social media execs grilled in Congress over child safety concerns; U.S. plans 'campaign' of retaliatory strikes after killing of 3 soldiers, officials say; FBI Director Christopher Wray warns of alarming hacking threat from China; and more on tonight's broadcast.

U.S. begins retaliatory strikes in Iraq and Syria as slain soldiers arrive home; Closing arguments in the Jennifer Crumbley involuntary manslaughter trial; Fulton County DA Fani Willis acknowledges personal relationship with special prosecutor; and more on tonight's broadcast.