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shocking attack. ukraine repelling intense russian attacks on the capital. plus, the new cia video urging russians to share war secrets the future of ai the ceo behind chatgpt describing his worst fears, calling for regulation of the tech he helped create plus, our exclusive with the ceo of microsoft. and the play at the plate. when a dust devil starts suddenly, a teenaged umpire has the save of the day. >> announcer: this is "nbc nightly news" with lester holt good evening, and welcome, everyone. with the clock ticking down to america defaulting on its debt, some potentially...

line in n the sand, , demandnding a work requirement for people on government assistance, saying a deal could be possible by week's end. what the two sides are saying tonight. the deadly mass shooting in new mexico. police saying the 18-year-old suspect was set to graduate high school with at least three guns and firing at random, three elderly women killed before he was stopped. just in, the secret service investigating an intrusion at the national security adviser's home. what happened. the sheriff's suspect in a baseball bat rampage in a congressman's office arraigned as he ...

Since its release last fall. ai's ability to write content, help people code and generate disinformation has raised alarms in washington. >> and now for some introductory remarks. >> too often we have seen what happens when technology outpaces regulation. >> reporter: in a hearing on capitol hill today, senator richard blumenthal used a voice cloning ai program to deliver remarks that he says were written by chatgpt to chair his concerns. >> my worst fears are that we cause significant, we, the field, the technology, the industry cause significant harm to the world. >> reporter: open ai ceo sa...