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Expert: Trump promised to 'Make America Great Again' but presided over its decline
04:26

Just hours before Joe Biden was set to be sworn in as the next U.S. president, it was no difficult to find Donald Trump's presidency has been a bumpy ride till the last, full of ups and downs, controversies and victories. CGTN spoke to Josef Gregory Mahoney, a professor of politics at East China Normal University, currently in Memphis, Tennessee.

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