Although presidents and other government officials have historically sworn the oath on a Bible, the Constitution doesn’t require it.

President-elect Donald Trump, from left, takes the oath of office as son Barron Trump and wife Melania Trump watch during the ...

President Trump did not place his hands on a stack of Bibles while taking the oath of office Monday, but he did not violate ...

President Donald Trump did not place his hand on the Bible as he took the oath of office during his inauguration on Monday.

Donald Trump is sworn in as the 47th president of the United States by Chief Justice John Roberts as Melania Trump holds the ...

Trump was sworn in as the 47th president of the United States on Monday, Jan. 20, taking the presidential oath without ...

Trump didn't place his hand on the Bible during his swearing-in, and some of his supporters are blaming John Roberts.

Images from the swearing-in show President Trump did not put his hand on a Bible as he was sworn in by Supreme Court Chief ...

Donald and Melania Trump arrive at the White House ahead of the inauguration ceremony on Monday in Washington, D.C. (Andrew ...

President Donald Trump did not place his hand on the two Bibles held by his wife, Melania Trump, when he took his second oath ...

President-elect Donald Trump, from left, takes the oath of office as son Barron Trump and wife Melania Trump watch during the 60th Presidential Inauguration in the Rotunda of the U.S. Capitol in ...