In God We Trust is the official motto of the United States. It has appeared on U.S. currency since the 1860s and was adopted as the official national motto in 1956.
E pluribus unum, Latin for "Out of many, one", is a motto on the Seal of the United States, along with Annuit cœptis("He approves our undertaking(s)") and Novus ordo seclorum("A new order of the ages."), and adopted by an Act of Congress in 1782. They are not the official motto of the United States.

Members of Congress on Monday called on President Obama to issue a public correction after he incorrectly labeled E pluribus unum the U.S.'s motto in a speech last month, rather than "In God We Trust."

The lawmakers, members of the Congressional Prayer Caucus, also said the president was making "a pattern" of dropping the word "Creator" when he recites the self-evident truths of the Declaration of Independence.

"By misrepresenting things as foundational as the Declaration of Independence and our national motto, you are not only doing a disservice to the people you represent you are casting aside an integral part of American society," the representatives said in a stern letter asking for him to correct the speech. See more here