The killing of the US ambassador to
Libya is rapidly becoming election fodder, as
Republicans seize on confusion over the circumstances of Chris Stevens' death in Benghazi three weeks ago and accuse the Obama administration of covering up an al-Qaeda connection.
US officials reiterated on on Friday that they regard the killing of Stevens and three other Americans working for the state department at the US consulate in Benghazi as an assault by terrorists who planned the attack.
But a dearth of real information about the exact circumstances of the assault has left open the question of whether such planning was merely the work of a few hours, to take advantage of a spontaneous anti-US protest over a short internet video that prompted demonstrations across the Middle East by offended Muslims, or weeks and months, to mark the 11th anniversary of al-Qaeda's 9/11 attacks on the US.
Disagreement over that question is dividing along political lines.
Earlier this week, Republican senators wrote to the US ambassador to the UN, Susan Rice, demanding that she explain her statement, five days after the killings, that they were part of a spontaneous anti-US protest. Four senators signed the letter, including John McCain, which said Rice made "several troubling statements that are inconsistent with the facts and require explanation".
The former New York mayor Rudolf Giuliani, who sought the Republican nomination for the presidency in 2008, went further, accusing the White House of a cover-up.
Speaking to Fox News, Giuliani said: "This is a deliberate attempt to cover up the truth, from an administration that claimed it wanted to be the most transparent in history. And it's the worst kind of cover-up: the kind of cover-up that involves our national security. This is a cover-up that involves the slaughter of four Americans."