After nearly 4 years of being President, the United States will have an election in November 2020 that will affect when does Trump leave office. If Joe Biden wins the 2020 Presidential election, Trump will no longer be president as soon as Joe Biden is inaugurated. Inauguration day will be Wednesday, 20 January 2020.
If Donald Trump wins re-election, he will have another four more years as president. This will means the Trump will have another 1461 days as president. No president can serve for more than two terms so Trump will be ineligible to run in 2024.
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