the possibility that jr. could be impeached because of a law sr. passed:
http://www.sfgate.com/cgi-bin/article.cgi?file=/chronicle/archive/2005/07/17/ING17DNJT81.DTL<exerpt>
Renegade ex-CIA agent Philip Agee spent years ripping the masks off fellow secret spies -- hundreds of them.
Troubled by U.S. covert activities in Latin America, in the 1970s he wrote an expose and launched the bimonthly "Covert Action Information Bulletin, " a Who's Who of CIA operatives with detailed biographies. By Agee's estimate, the Agency had 5,000 officers experienced in clandestine operations, and he gleefully predicted "it should be possible to identify almost all of those who have worked under diplomatic cover."
The CIA was flabbergasted to discover no law against this. But it had a powerful friend in the next U.S. vice president, a former CIA director.
George H. W. Bush made it his mission to get legislation making it a felony to out a covert agent. "I don't care how long I live, I will never forgive Philip Agee and those like him who wantonly sacrificed the lives of intelligence officers, " he said.