Sean Rayford/PAUL J. RICHARDS/AFP/Getty Images
Now playing
01:10
Clinton: Sanders 'flip-flopped' on guns
CBS
Now playing
01:43
Hillary Clinton defends Bill not resigning
CNN
Now playing
02:12
Clinton: Kavanaugh ceremony a political rally
Now playing
01:48
Clinton laughs at Kavanaugh's comment
CBS
Now playing
01:00
Hillary Clinton makes cameo on 'Murphy Brown'
hillary clinton amanpour impeachment_00014522.jpg
hillary clinton amanpour impeachment_00014522.jpg
Now playing
01:47
Clinton: Impeachment 'will be left to others to decide'
hillary clinton republicans amanpour intv vpx_00000000.jpg
hillary clinton republicans amanpour intv vpx_00000000.jpg
Now playing
03:04
Clinton: Civility starts by electing Democrats
Now playing
00:55
Clinton ends Franklin tribute with smartphone
CNN
Now playing
01:49
Clinton rejects Trump comparisons to her husband
Schomburg Center
Now playing
01:58
Bill Clinton: I apologized for Lewinsky scandal
US President Donald Trump (L) and Russian President Vladimir Putin arrive for a meeting in Helsinki, on July 16, 2018. (Photo by Brendan Smialowski / AFP)        (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
BRENDAN SMIALOWSKI/AFP/Getty Images
US President Donald Trump (L) and Russian President Vladimir Putin arrive for a meeting in Helsinki, on July 16, 2018. (Photo by Brendan Smialowski / AFP) (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)
Now playing
04:21
Fact check: Hillary Clinton's misleading comments
Former US Secretary of State Hillary Clinton speaks at the Eighth Annual Women in the World Summit at Lincoln Center for the Performing Arts on April 6, 2017, in New York City.
Angela Weiss/AFP/Getty Images
Former US Secretary of State Hillary Clinton speaks at the Eighth Annual Women in the World Summit at Lincoln Center for the Performing Arts on April 6, 2017, in New York City.
Now playing
00:39
Hillary Clinton goes after al-Assad, Putin
AUSTIN, TX - NOVEMBER 17:  Former U.S. Secretary of State Hillary Rodham Clinton signs copies of her new book 'What Happened' at BookPeople on November 17, 2017 in Austin, Texas.  (Photo by Rick Kern/WireImage)
Rick Kern/WireImage/WireImage
AUSTIN, TX - NOVEMBER 17: Former U.S. Secretary of State Hillary Rodham Clinton signs copies of her new book 'What Happened' at BookPeople on November 17, 2017 in Austin, Texas. (Photo by Rick Kern/WireImage)
Now playing
01:29
Clinton: Trump parrots what Putin says
TV3
Now playing
01:01
Clinton: Children treated as political pawns
Broadway Video/Universal Television
Now playing
01:15
Miley Cyrus tears up thanking Hillary Clinton
RBG on sexism and HRC_00010727.jpg
RBG on sexism and HRC_00010727.jpg
Now playing
01:50
RBG says Clinton was criticized worse than men

Story highlights

Clinton praises Sanders for his "flip-flop" on gun control legislation

The FBI has not interviewed her yet about her private email server, Clinton tells Jake Tapper

(CNN) —  

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 then called on her rival to do the same with the so-called “Charleston loophole,” which allows licensed dealers, once they have initiated a federal background check, to complete the gun sale in question if they haven’t hears back from authorities after three days.

Health care

Clinton also defended her campaign’s decision to employ daughter Chelsea as a surrogate and critic of Sanders.

At an event last week, Clinton’s daughter accused the Vermont senator of attempting to “dismantle” popular programs like Medicare as part of his push for single-payer health care.

But Clinton defended the comment Sunday, calling it “factual” and suggesting Chelsea had not sought out the issue, but simply “been asked a question.”

FBI investigation

Asked about the ongoing probe into her use of a private email server during her time leading the State Department, Clinton said he not been interviewed by the FBI.

Clinton is not under investigation by the bureau, and is not the subject of any criminal investigation, but her use of the private server – instead of a more deeply encrypted government account – set off what’s known as security referral, or inquiry into the location of certain pieces of classified information.

Republicans’ suggestions that Clinton’s server holds previously unseen communications about the deadly 2012 assault on the American outpost in Benghazi, Libya, has provided fodder for a long series of political attacks.

Still, Clinton said she had not yet seen the new movie about the Benhazi raid, released nationally last week, which doesn’t name her but does cast blame on bureaucratic officials for not doing more to aid the contractors and U.S. ambassador killed after militants stormed their compound.

Health records

The former secretary of state also addressed the pressure on the 74-year-old Sanders to release his medical records.

“I’ve released my medical records and I remember being asked frequently to do so,” Clinton said, adding she would the decision was now “up to his campaign.”

On Saturday, Clinton’s own campaign chairman, John Podesta, seemed to push back again super PAC chief David Brock.

“Chill out,” he wrote in a tweet after reports of the group’s plans began to spread. “We’re fighting on who would make a better President, not on who has a better Physical Fitness Test.”

Speaking with Tapper after Clinton, Sanders said he was healthy and planned on releasing details soon.