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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.
Once you have begun to testify in an incriminating manner without claiming the Fifth Amendment privilege against self-incrimination, you may lose the privilege and the right to refuse to answer. If you are called as a witness in front of the Grand Jury, you will not be able to have a lawyer present with you.