>about the intelligence of agreeing to do this hearing at all, If MZ didn't voluntarily offer himself to testify, Congress could proceed to formally subpoena h

>about the intelligence of agreeing to do this hearing at all, If MZ didn't voluntarily offer himself to testify, Congress could proceed to formally subpoena him. MZ could then ignore the subpoena but then he could theoretically go to jail for "contempt of Congress".