While this statute is phrased as an unconditional obligation, the [[Fifth Amendment]] takes precedence over it. For this reason, many witnesses called to testify at Congressional hearings plead the Fifth Amendment and refuse to testify. | While this statute is phrased as an unconditional obligation, the [[Fifth Amendment]] takes precedence over it. For this reason, many witnesses called to testify at Congressional hearings plead the Fifth Amendment and refuse to testify. |