Rep. Ackerman (D-NY) totally kicks these peoples asses. I'm loving it. It's very funny.
As you'll see, SEC officials refuse to answer the committee's basic questions about the Madoff scandal, and the agency's acting general counsel, Andy Vollmer (a Bush holdover and maxed-out donor to John McCain's presidential campaign) explicitly cites executive privilege as his legal rationale for refusing to provide basic information to federal lawmakers.
Whole story on Crooks and Liars (appropriate!)