You can always plead the fifth...
Immunity or not, they can't make you incriminate yourself...
After the way Scooter Libby was treated, if I was a government employee, I'd plead the fifth if they asked me anything....
Jim Comey needs to resign!
Well, if you can't be prosecuted (via immunity) how can you possibly "expose yourself to prosecution"?
Also, since they are not looking to punish these "witnesses" but rather extract additional information about them to implicate "her"...it appears they can be forced to answer such questions.
Who's looking to prosecute "them"?
And, finally, since a Congressional committee is an extension of "We the People" and is neither an actual court of law (the US court system being a vestigial entity based on the British system where the "court" represented the monarchy) nor a police agency which also represents the court....I'm not even sure how they can even twist the use of the 5th Amendment to apply to questioning members of the "People's House".
When the Constitution does, in fact, refer to functions of Congress, it explicitly states words such as "Congress shall pass no law...etc." What is the answer to that?
Scooter Libby testified before a Grand Jury, and was prosecuted by a court.