grand jury, judicial,
administrative, and congressional proceedings, and they are supplemented by a
provision in Section 1512(b) aimed specifically at conduct intended to prevent or
hinder the communication to law enforcement of information related to a federal
crime.
</p><!--l. 156--><p class="noindent" >
</p>
   <h5 class="likesubsubsectionHead"><a 
 id="x1-27000A."></a>Constitutional defenses.</h5>
<!--l. 158--><p class="noindent" >As for constitutional defenses arising from the President&#x2019;s status