Barack Obama has taken the oath of office for a second time after stumbling over the words when originally sworn-in as president.
In a highly unusual move, the new leader took the oath in the Map Room of the White House, the day after his inauguration as the nation's first African-American president.
Chief Justice John Roberts, who first administered the oath on Tuesday on the steps of the US Capitol, again performed the ceremony.
But this time in front of only a handful of staff and journalists - and with no bible.
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"We believe that the oath of office was administered effectively and that the President was sworn in appropriately (on Tuesday)," said White House legal adviser Greg Craig.
"But the oath appears in the Constitution itself.
