India, Jan. 21 -- US President Donald Trump seemed to forget this important custom when he took the oath of office on Monday.

First Lady Melania Trump carried two Bibles for her husband's swearing-in ceremony. However, it seems that when Chief Justice John Roberts swore Trump in as president, he did not place his hand on the Bibles. None of those bibles was the infamous "Trump Bible" that her supporters can buy for $60.

According to a press statement from the inauguration committee, Trump's mother gave him one of the books in 1955 to "mark his Sunday Church Primary School graduation at First Presbyterian Church, in Jamaica, New York."

Another sacred document was the Lincoln Bible, which was used during the oath ceremony of the16th pres...