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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 there is little point to making that odd choice because the defendant can call the plaintiff as a defense witness in the defense case, and the plaintiff has no right to refuse to be called as a defense witness. So, one way or another, the plaintiff can be compelled to testify.