When the question of the new coinage came up we looked into the law and found there was no warrant therein for putting 'In God We Trust' on the coins. As the custom, although without legal warrant, had grown up, however, I might have felt at liberty to keep the inscription had I had approved of its being on the coinage. But as I did not approve of it, I did not direct that it should again be put on. Of course the matter of the law is absolutely in the hands of Congress, and any direction of Congress in the matter will be immediately obeyed. At present, as I have said, there is no warrant in law for the inscription.

"In God we Trust" letter (1907)