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letting their voices be heard. chief patrol agents in charge of the rio grande valley and tucson sectors in extensive detail why millions have been able to cross the southern border since president biden took office and putting the blame squarely on the policies coming from the white house. >> sandra: will their testimony put more pressure on president biden to secure the border. that is a huge question. brandon judd is here to weigh in. that's coming up. >> china is the most challenging national security threat america has faced in 30 years. >> the prc is a learning machine. xi jinp...

>> they're spying on us. they're doing this purposefully and the president should have been much stronger in his response to this. >> all right. a live at the nation's capitol where in just a few hours, the president will be delivering his state of the union address but will the china spy flight overshadow the big speech. we're all over it with jared burn steen on the president's economic message tonight. the senate minority whip john thune on what republicans want to hear. ben car den on if the china spy balloon is threatening to inflate that message. and cry sununu on what he think...

I think is very helpful in that regard. >> the u.s. flew u2 spy planes alongside the airship as it crossed the u.s. collecting intelligence on its capabilities, including transmitting signals. the u2 planes, which can fly at seven thousand feet, even scrambled messages to the chinese airship to negate its intelligence gathering ability as it crossed over a us trace. >> jennifer, thank you. alex murdaugh is the alleged financial crimes took center stage tuesday as prosecutors try to prove a motive for the murders of his wife and son. the head of finance for murdoch's former law firm testified t...

Find it on a timely -- in a timely manner? >> well, first of all, aircraft are normally tracked through acars and other equipment, but if this equipment is tampered with, switched off or damaged or electrical power is lost to it, then, indeed, that tracking will fail. so you know, it's difficult to come up with something that is fail-proof, that allows aircraft to be tracked. >> right. >> but let me put this to you. there is an elt, the electronic locator transmitter, which sits in the roof of the aircraft, the 777, near the tail, and that's supposed to start transmitting signals to satellite ...

But they believe now that they have some information at least that indicates this plane may have flown up to four or five hours out into the indian ocean and that may provide the final answer about what happened to this flight. wolf? >> if it flew four or five hours after the transponders stopped transmitting signals back to ground station, it could have gone a lot further than the indian ocean, right? >> they have calculated at this point the range of the aircraft, based on the fuel that they thought would have been left from the last time they had communication with it. that's part of why th...