Democratic front-runner Hillary Clinton is sharpening her criticism of rival Bernie Sanders as he narrows the gap between them just weeks ahead of the Iowa caucuses.

Clinton has widened her health care critique to include the Vermont senator, saying he would "rip up" the Affordable Care Act. Sanders has said he would push a single-payer system.

Last week, her campaign reminded voters that Sanders had backed legislation in 2005 that protected gun-makers from lawsuits.

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