You try to quash the subpoena based on your Constitutional privilege against self-incrimination, since handing over the records clearly would incriminate you.

FORBES: IRS Can Make You Produce Offshore Bank Records Even If Self-Incriminating

Nevertheless, for the first time the Supreme Court recognized the constitutional basis for executive privilege.

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The justices did not address the constitutional underpinnings of the broad assertion of executive privilege.

CNN: Executive privilege: Legitimate claim or blocking move?