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and after he stole the show from his congressman dad, the 6-year-old telling us about his viral moment of fame. >> reporter: this is "nbc nightly news" with lester holt. >> good evening and welcome. president biden tonight sidestepping congress and taking his own action to sharply tighten controls at the southern border. with his signature alone, the president using his executive authority to shut down asylum requests when the average daily number of illegal crossings between ports of entry exceeds 2500. tonight that average number tops 4,000, putting the new directive into immediate effect. the president looking to turn the tables on republicans on an issue that has left him politically vulnerable. in his remarks announcing the new order, president biden saying doing nothing is not an option, and that he would have preferred to address this issue through bipartisan legislation. but many republicans in congress tonight dismissing the president's actions as