Washington (CNN) Former Arizona Rep. Gabby Giffords, a key voice on gun violence prevention, has endorsed former Vice President Joe Biden, calling him the "choice for a true gun safety president."

"Joe Biden leads with his heart. He has the compassion and toughness to lead on gun safety," Giffords said in a statement Wednesday morning. "I've witnessed him comfort the survivors of gun violence, and I've seen him fight for solutions to gun violence—and win. This is the leadership we need in the White House. Joe Biden is the choice for a gun safety president."

In a video announcing her endorsement, Giffords said, "He was there for me, time and time again. He will be there for you too."

Biden thanked Giffords for her support, calling her an "American hero who embodies the courage and tenacity we need to take on and defeat the gun lobby."

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