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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.
At a criminal trial, it is not only the defendant who enjoys the Fifth Amendment right not to testify. Witnesses who are called to the witness stand can refuse to answer certain questions if answering would implicate them in any type of criminal activity (not limited to the case being tried).