Lois Lerner, the IRS official who headed the division that targeted Tea Party and other conservative groups for special tax scrutiny, invoked her Fifth Amendment right to refuse questions before Congress on Wednesday.
But that doesn't mean that she won't be forced to answer questions. In fact, it's relatively easy for Congress to force her to testify.
In general, Congress hates when government officials refuse to answer questions. This time, of course, it is especially those in the House's Republican majority who are unhappy.
Republican Darrell Issa, the chairman of the House Oversight Committee, required Lerner to come before the committee and invoke her Fifth Amendment in person at the hearing, rather than just letting her lawyer inform the committee that she's not going to answer their questions. That's not something you do to a witness you regard as friendly.