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Thus, a person called to testify before Congress can refuse if they believe the government could use the testimony against them in criminal proceedings. To render the protections against self-incrimination ineffective, Congress can provide immunity from criminal prosecution.
But I may be... show more I see lots of people saying that Bush can ignore subpoenas, and that Congress cannot compel executive branch officials to testify under oath at Congressional hearings. I've looked, and I cannot find any law or case the gives the Executive Branch blanket immunity from Congressional subpoenas.