Secretary of State Hillary Clinton has angrily defended her handling of the raid on a US consulate in Libya, in back-to-back hearings on Capitol Hill.
Mrs Clinton lashed out at a senator who accused the Obama administration of misleading the public.
She took responsibility for security failures that led to the 11 September attack but said she had not seen requests for more security beforehand.
It was her last appearance at Congress as America’s top diplomat.
“Nobody is more committed to getting this right,” Mrs Clinton told the Senate foreign relations committee.
“I am determined to leave the state department and our country safer, stronger and more secure,” she added.