Secretary of State Clinton, in a sharp departure from her stance when she was a senator, is warning that any American action, even symbolically, toward recognizing Jerusalem as the capital of Israel must be avoided for the reason that it would jeopardize the peace process. Her warnings were issued in a brief she has just filed with the Supreme Court — in which she is arguing that a law she voted for when she was Senator is unconstitutional because it could require the U.S. government to give to an American citizen born at Jerusalem papers showing the birthplace as Israel.