WASHINGTON - Bradley Birkenfeld is the most significant financial whistleblower of all time, so you might think he'd be cheering on the disclosures in the new Panama Papers leaks. But today, Birkenfeld is raising questions about the source of the information that is shaking political regimes around the world.

Birkenfeld, an American citizen, was a banker working at UBS in Switzerland when he approached the U.S. government with information on massive amounts of tax evasion by Americans with secret accounts in Switzerland. By the end of his whistleblowing career, Birkenfeld had served more than two years in a U.S. federal prison, been awarded $104 million by the IRS for his information and shattered the foundations of more than a century of Swiss banking secrecy.