Sanders: I won't 'apologize' for national security stance
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Democratic presidential candidate Bernie SandersBernie SandersGOP vows to use Pelosi against Democrats in 2018 Trump: Hillary Clinton colluded with Democrats to defeat Bernie Sanders Sanders: GOP healthcare bill is a 'moral outrage' MORE is defending his record on national security as he comes under increasing fire from rival Hillary ClintonHillary Rodham ClintonTrump: Calling Warren Pocahontas ‘an insult to Pocahontas’ GOP vows to use Pelosi against Democrats in 2018 Schiff: Obama's delayed response to Russian interference 'a very serious mistake' MORE's campaign ahead of the Iowa caucuses. 

"I voted against the war in Iraq, Hillary Clinton voted for the war in Iraq," the Vermont senator told reporters Wednesday. "That may tell people about ... judgment. I'm not going to apologize to anybody about my judgement on foreign policy." 
 
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Asked how he would respond to criticism from Clinton supporters that his foreign policy is "dangerous," Sanders doubled down on his criticism of Clinton's Iraq War vote, calling the military conflict "the major foreign policy issue in the modern history of this country." 
 
The comments come after top officials for the former secretary of State's campaign stepped up their criticism of Sanders, suggesting he was inexperienced on foreign policy. 
 
Ten former officials, who are also supporting Clinton, also said earlier this month that they are "concerned that Sanders has not thought through these crucial national security issues that can have profound consequences for our security."
 
But Sen. Dick Durbin (D-Ill.), who is supporting Clinton, came to Sanders's aid on foreign policy Wednesday, saying he didn't have any concerns about his ability to be commander-in-chief. 
 
The latest rhetorical scuffle between the two Democratic candidates comes as they are locked in a neck-and-neck battle for the top spot in Iowa with just days left to go before the caucuses.