Hillary: Benghazi was 'biggest regret'

Hillary ClintonHillary Diane Rodham ClintonO’Malley tells Dems not to fear Trump FBI informant gathered years of evidence on Russian push for US nuclear fuel deals, including Uranium One, memos show Pelosi blasts California Republicans for supporting tax bill MORE called the Benghazi terror attack the “biggest regret” of her tenure as secretary of State on Monday, a message she's expected to emphasize as she ponders a 2016 White House run.

Republicans have hammered Clinton over the death of Ambassador Christopher Stevens and three other Americans in 2012, chipping away at her record on national security. An internal review of the attack faulted the State Department for failing to provide better security at the U.S. consulate but Republicans say Clinton has unfairly escaped blame.

Clinton slammed her critics at a Senate hearing last year – when she famously demanded to know “what difference does it make?” She has since adopted a different tone.

“My biggest, you know, regret is what happened in Benghazi,” Clinton said when asked to identify “do-overs” of her time as America's top diplomat during her keynote appearance before the National Automobile Dealers Association in New Orleans.

“It was a terrible tragedy,” she said.

Read more from The Hill.