Hillary Clinton to Testify on Benghazi Embassy Attack
Mrs Clinton will face questions about security failures that led to the attack before the foreign relations committees of the Senate and the House.
She had been due to testify late last year but fell ill.
The US envoy to Libya Christopher Stevens and three other officials were killed in the attack on 11 September.
The ambassador died of smoke inhalation when he was trapped in the burning consulate building, after armed men had stormed the compound.
The assault triggered a major political row over who knew what and when. As a result, an independent panel - the Accountability Review Board- was charged with investigating the incident.