Hillary Clinton is escalating her attacks on Democratic primary rival Bernie Sanders, criticizing his opposition to a 2005 gun control bill and saying his health care plan will raise costs for American taxpayers and families.

Clinton is calling Sanders’ proposal for a single-payer health care system a “risky deal,” that would “hurt more than help” a lot of American families. She says his plan would undermine the Affordable Care Act and give Republican governors power over health care.

She’s also trying to create distance between Sanders and Obama’s push for new gun control laws.

Her attacks come as polls show the race for the Democratic nomination tightening in Iowa. Voters in that state will cast the first ballots of the primary race on Feb. 1.

(AP)