ABC News' Ann Compton Reports: Frances Townsend, assistant to the president for Counterterrorism and Homeland Security, will depart at the end of the year.
Townsend has worked for the government for 21 years -- serving both Republican and Democratic administrations: Townsend was a top aide to Janet Reno at the Clinton Justice department. Under Bush she served as the head of anti-terrorism and became Homeland Security Adviser following Tom Ridge's departure.
In the wake of Hurricane Katrina, Townsend wrote the "Lessons Learned" report highly critical of the government's response to the storm.
The president is expected to announce Townsend's departure later today.