Former Rep. Gabby Giffords (D-Ariz.) appears in a new ad released by Hillary ClintonHillary Diane Rodham ClintonBiden slams Trump over golf gif hitting Clinton Overnight Cybersecurity: Equifax hit by earlier hack | What to know about Kaspersky controversy | Officials review EU-US privacy pact Overnight Tech: Equifax hit by earlier undisclosed hack | Facebook takes heat over Russian ads | Alt-right Twitter rival may lose domain MORE's campaign, highlighting the Democratic presidential candidate's commitment to stopping gun violence.

"We have a gun violence problem so I'm voting for Hillary Clinton," Giffords says in the ad. "She's tough. She will stand up to the gun lobby.

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"She will fight to make our families safer. It matters."

Giffords was shot in the head during a mass shooting in 2011 while speaking to constituents in Tucson, Ariz. She was forced to retire from Congress due to her injury.

Since leaving Congress, she and her husband, retired astronaut Mark Kelly, founded a gun control advocacy group called Americans for Responsible Solutions. The couple endorsed Clinton in January.