people from grave dangers on social media, with angry victims relatives in the room. i ll speak with a senator that co-s co-sponsored, richard blumenthal. donald trump meets with the teamsters, hoping to drive a wedge between president joe biden and his traditionally loyal allies in organized labor, this as nikki haley is unleashing her sharpest attacks on him yet. and a dire new warning from the fbi director, that chinese hackers are preparing to, quote, wreak havoc on the united states. stand by for details on potential targets and the serious harm that could come too americans. welcome to our viewers around the world. wolf blitzer is off today. i m alex mar equity. you re in the situation room. our top story tonight, some of the biggest nay in the tech industry confronted about the perils of social media, and many young people who are suffering, even dying. cnn s tom foreman has more on the often combative senate hearing, which included a stunning apology. you