Role/functions/power of Congress - Congressional Oversight of the Executive

Here, former Secretary of State Hilary Clinton gets 'overseen' by Senate Foreign Relations Committee in Jan 2013. The hearing relates to the mob-murder of US Ambassador to Libya and the extent to which the US government were to blame or could have avoided the attacks.

Telegraph article

Hillary Clinton appears at Senate Foreign Relations Committee• 'I take responsibility' for Benghazi, says Clinton• 'Arab revolutions' shattered security across region• Clinton chokes up when talking about Benghazi diplomats• Hits out at allegations of cover up

In an emotional appearance in front of the Senate Foreign Relations Committee, Mrs Clinton cast the incident, the first in which a USambassador was killed since 1988, as part of a long history of such violence as well as the result of regional instability since the Arab Spring of popular revolutions began in 2011.
Speaking in congressional testimony delayed by more than a month because of her ill health, Mrs Clinton offered her first detailed accounting of the first days after the attack, saying she directed the US response from the State Department.
"I take responsibility," Mrs Clinton said, echoing comments she first made in October and stressing that she has accepted all of the recommendations of an independent review panel that ultimately held lower-level officials responsible.