Secretary of State Hillary Clinton took a question from Sen. Bob Corker (Tenn.), the ranking Republican on the Senate Foreign Relations Committee in testimony on Benghazi. Lawmakers are investigating the Sept. 11 terror attack on the U.S. Consulate that killed four Americans.

Corker asked what steps can be taken so that in the future the Secretary of State would be able to respond more effectively to requests for additional security.

In her response, Clinton said she has "thought about this almost constantly since

(the attack)," adding that she feels responsible for all State Department employees and takes security "very seriously."

Watch the full exchange: