By October 1, financial institutions are supposed to take extra steps to verify the identity of account holders. But members of Congress are pressuring banks not to use one particular form of ID: the matricula consular, issued by Mexico to its nationals outside the country. They say the card is easy to forge, and encourages illegal immigrants to stay in the United States. But banks and immigrants' rights groups say it's better to encourage immigrants to keep their money in banks, so authorities can track their money. NPR's Larry Abramson reports.