U.S. Sens. Amy Klobuchar and Heidi Heitkamp have honored Cindy McCain for her work fighting human trafficking.

McCain, wife of U.S. Sen. John McCain, was presented with the Anne Frank Special Recognition Award by the Anne Frank House Amsterdam for her work to raise awareness and educate the public on human trafficking. Klobuchar and Heitkamp have worked with McCain to combat human trafficking.

"As a former prosecutor, I've seen firsthand the horror and violence women and children suffer as victims of human trafficking," Klobuchar, D-Minn., said. "Trafficking is now the third largest criminal enterprise in the world, and we need to crack down on this crime while providing victims the support they need."

Heitkamp, D-N.D., added: "Cindy has been a beacon of hope for so many victims of human trafficking. She walks the walk and has been relentless in tackling this issue both globally and nationally."