WASHINGTON President Joe Biden has urged Americans to "stand guard" against threats from oligarchs, disinformation and AI in a future under Donald Trump as he delivered a dark farewell address ahead of stepping down next week. Biden, who will be succeeded by Trump on Jan. 20, touted his achievements in steering the U.S. economy out of the deep crisis inflicted by the COVID-19 pandemic, and said he had made the nation's alliances abroad stronger. However, in his brief Oval Office speech on live

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