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...The president is taking the oath twice this time because technically, Inauguration Day falls on Sunday, Jan. 20, and the modern tradition has been that when that happens, the president takes a private oath on Sunday and does it again in public for the big ceremonial event on Monday.More here.
It wasn't always like that. The first two presidents whose inauguration days fell on a Sunday waited until Monday to take the oath. The legal authority for doing that was none other than the founding father and great Chief Justice John Marshall...
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