Hillary Clinton on Sunday sharpened her attacks on Bernie Sanders over the Vermont senator’s record on gun control, just hours ahead of their fourth debate as both vie for the Democratic presidential nomination.

“I am very pleased that he flip-flopped on the immunity legislation,” Clinton told CNN’s Jake Tapper on “State of the Union,” a day after Sanders, who had been hammered by her campaign for his past position, announced he would change course and back legislation to reverse a 2005 law granting firearm manufacturers legal immunity.

READ: Best of ‘State of the Union’: Trump, Clinton and Sanders

Gun loophole

She