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How can you refuse to testify?

Over here if you are called as a witness and you dont show then you are held in contempt of court, I thought it was the same in America.

Rove is a traitor to the United States of America.
He should be given a subpoena and forced to testify before Congress! Rove assisted in the outing of Plame from the CIA and has been involved in many "dirty tricks" including the vote count in Florida. I can not think of a person more deserving of a jail cell other than Bush, Cheney, Rumsfeld, Rice et. al.