| President Bush said in a statement that Townsend "has ably guided the Homeland Security Council. She has played an integral role in the formation of the key strategies and policies my administration has used to combat terror and protect Americans." Her departure continues an exodus of key Bush aides and confidants, with his two-term presidency in the final 15 months. Top aide Karl Rove, along with press secretary Tony Snow and senior presidential adviser Dan Bartlett, left earlier this year. [Associated 
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