Swiss banking whistle-blower Bradley Birkenfeld has changed legal teams and tactics in his efforts to get out of prison and claim a multimillion-dollar reward from the Internal Revenue Service.

The new legal team for Birkenfeld, a former banker for UBS AG, plans to ask President Obama to commute the 40-month sentence the ex-banker is now serving for conspiracy to defraud the U.S. government, according to Stephen M. Kohn, executive director of the National Whistleblowers Center.

Kohn said the petition will be filed April 15. Birkenfeld pleaded guilty in 2008 and is not seeking an appeal. He is incarcerated at the Schuylkill Federal Correctional Institute.

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