working cooperatively

John A. DiCicco, Deputy Assistant Attorney General for the Justice Departments Tax Division said in a statement:

We are working cooperatively with both the Swiss government and UBS to obtain this information. However, we are prepared to seek enforcement if that process is not successful.

Of course, with $20 billion in hidden assets at UBS, there are probably some major players who may have some influence at top government levels and who may attempt to squash the investigation.