Barack Obama shakes hands with Republican presidential nominee Mitt Romney (AP/David Goldman)
President Barack Obama assumed responsibility over any mistakes made in dealing with the deadly terror attack in Libya last month that killed four Americans just hours after Secretary of State Hillary Clinton sought to shoulder the blame.
"She works for me," the president said in New York in his second debate with Republican challenger Mitt Romney. "I'm the president and I'm always responsible, and that's why nobody's more interested in finding out exactly what happened than I do."
With three weeks before the presidential election, the administration has been unable to put to rest its handling of the Benghazi attack that killed ambassador Chris Stevens, a State Department computer specialist and two former Navy Seals who were working as contract security guards.
Mr Obama's statement came amid a spirited back-and-forth with the former Massachusetts governor over the assault on the consulate, the only significant foreign policy disagreement in an hour-and-a-half exchange dominated by domestic concerns.
Mr Romney challenged the president to explain why US officials argued for more than a week after the September 11 assault that it stemmed from a protest against a film produced in the US ridiculing Islam.
"Whether there was some misleading, or instead whether we just didn't know what happened, you have to ask yourself why didn't we know," Mr Romney said. "It was very clear this was not a demonstration. This was an attack by terrorists."
The two also traded jabs on how quickly the president declared Benghazi an act of terror - with Mr Romney insisting it took two weeks and Mr Obama saying he said as much the day after in an address from the White House Rose Garden.
That drew an intervention from the moderator, CNN's Candy Crowley, who appeared to side with Mr Obama.
Before the debate, Mrs Clinton tried her best to defuse an issue that is threatening to become a potential obstacle to Mr Obama's re-election campaign.
In a statement that could have long-term ramifications given the persistent speculation that she might run for president in four years' time or stay in public life, Mrs Clinton accepted responsibility for the safety of the State Department's staff and diplomatic missions.