An extraordinary moment at a contentious hearing on Capitol Hill as Mark Zuckerberg stands up to apologize after he and other tech execs were accused of having blood on their hands. Plus, the fate of Ukraine's top general is up in the air this evening. Could a major military shake-up be under way? What that means for the state of the war. And, a stark warning from the FBI Director on major threats facing the US. Christopher Wray says hackers in China are preparing to wreak havoc, and we aren't paying enough attention.

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