Since 1956, the official national motto of the United States has been "In God We Trust." The motto also appears in the national anthem, and on the nation's currency.

In a speech given Nov. 10 to students in Jakarta, Indonesia, Obama said that the United States and Indonesia share a similar history: "It is a story written into our national mottos. In the United States, our motto is 'E Pluribus Unum.'"

The members of the Congressional Prayer Caucaus said that it was "unacceptable" for the president to misrepresent the national motto: "The president is the primary representative of our nation to the world, and whether mistake or intention, his actions cast aside an integral part of American society."

"President [Ronald] Reagan once warned that 'If we ever forget that we're one nation under God, then we will be a nation gone under,'" the letter added.

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