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drugs. tough, new auto emission standards about to be announced, but will they push more americans to go electric a big upside of artificial intelligence, detecting cancer much earlier, and predicting when it might strike and the young, bold athletes sharing their culture and superstar tony hawk. >> announcer: this is "nbc nightly news" with lester holt >> welcome. once again, in the tragic aftermath of a mass shooting, were getting a person look at pol risking their own lives to...

policy both at state, city, federal i simply ask you to do something. because doing nothing, which is what weve been doing, is not working. we have to do something because this is just getting out of hand across our city and across this great nation of ours >> the louisville doctor who treated victims of mondays mass shooting is among the growing voices calling for action on gun violence well have the latest on the survivors and the investigation straight ahead plus the manhattan dis...

and then getting back up to reengage. officers being hailed as heroes for stopping him from killing more people. were there warning signs? and what his neighbors are saying. damage control. new revelations from the leaked classified intelligence documents, putting u.s. alliances in question. the manhattan district attorney sues a top house republican, claiming interference in the investigation of donald trump. the battle over an abortion pill. big pharma pushing back against a ruli...

Republican committee chairman jim jordan to force testimony or acquire documents related to his prosecution of donald trump are purely political with no legislative purpose. jordan responding tonight in part in a tweet that reads "first they indict a they indict a president for no crime, then they sue to block congressional oversight." lester, back to you. >> thank you. major backlash at the abortion ruling. now some states are stockpiling abortion drugs as the legal battle plays out. laura ja...

With adam, whos so smart in the prior segment. i have a little different take on it. it is strange that republicans have been consistently attacking mail-in voting because it used to be that mail-in voting advantaged republicans. and so its not clear, you know, in the end what the practical impact of all these changes are going to be. its probably going to be that less poor people and people of color vote. i think really what they are trying to do is just perpetuate this idea that there is fraud...