White House Homeland Security Advisor Fran Townsend was asked at a press conference earlier this week what evidence she had that Osama Bin Laden was still alive, considering the fact that he has been gravely ill and on a kidney dialysis machine while traversing the harsh terrain of the Pakistani border region. Townsend's response was to refuse to discuss the matter and immediately leave.

Here's the exchange from the end of the press conference (watch the video and cycle to the final 2 minutes).