
The helicopter carrying former President Barack Obama leaves U.S. Capitol after Donald Trump was sworn in as the 45th president of the United States in Washington D.C., the United States, on Jan. 20, 2017. (Xinhua/Bao Dandan)

The helicopter carrying former President Barack Obama leaves U.S. Capitol after Donald Trump was sworn in as the 45th president of the United States in Washington D.C., the United States, on Jan. 20, 2017. (Xinhua/Bao Dandan)
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