Representatives of the banking industry, unions and consumer groups says enough is enough.
They're planning to attend a public hearing today to oppose Wal-Mart's attempt to operate an in-house bank.
The opponents says Wal-Mart already is too big with 3,900 stores accounting for 10% of the U.S. retail market.
They say a Wal-Mart bank would unfairly concentrate power over retail and small-business lending in one company that is already the biggest business in many small towns and rural communities.
Wal-Mart is pledging to stay out of branch banking and consumer lending.
Supporters say Wal-Mart's move into banking would benefit consumers by lowering fees and prices