Bernie SandersBernie SandersThe Hill's Morning Report - Sponsored by AdvaMed - House panel expected to approve impeachment articles Thursday Warren, Buttigieg duke it out in sprint to 2020 The Memo: Pelosi-Trump trade deal provokes debate on left MORE attacked Hillary ClintonHillary Diane Rodham ClintonDemocrats seek leverage for trial Davis: Trump vs. Clinton impeachments – the major differences Sharice Davids to vote for Trump impeachment articles: 'The facts are uncontested' MORE during Saturday night's Democratic presidential debate for her vote in support of authorizing war with Iraq as a senator in 2001, drawing a direct link between the U.S. invasion and the rise of radical Islamic groups like Islamic State in Iraq and Syria in the region.

“The disastrous invasion of Iraq, something I strongly opposed, has unraveled the region completely and led to the rise of al Qaeda and ISIS,” Sanders said.

“I don’t think any sensible person would disagree that invasion of Iraq led to the level of instability we’re seeing now, it was one of the worst foreign policy blunders in the history of the United States,” the Vermont senator continued.

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Clinton responded saying that she’s since acknowledged that the decision to invade Iraq was based on bad intelligence.

“I have said the invasion of Iraq is a mistake,” the former secretary of State said. “But if we’re really going to tackle the problems posed by jihadi extreme terrorism, we need to understand it ... and continue to be vigilant about it.”

At the outset of the debate, Clinton emphasized national security as the chief responsibility of the next commander in chief, a contrast from Sanders who focused his opening statements largely on his economics-rooted stump speech.

“We need to have a resolve that will bring the world together to root out the kind of radical jihadist ideology that motivates organization like ISIS, a barbaric, ruthless violent jihadist terror group,” she said to start.

“All of the other issues we want to deal with depends on us being secure and strong.”

Immediately before Clinton, Sanders called for the U.S. to “rid our planet of this barbarous organization called ISIS,” but he quickly moved back into his stump speech based on income inequality.

Sanders’s campaign reportedly sparred with CBS over the decision to emphasize foreign policy, according to multiple media reports, but Sanders campaign manager Jeff Weaver told CNN that the disagreement stemmed not from the subject but from an abandoned push to limit opening statements.