The inability to enact new gun safety laws after the Sandy Hook school shooting ranks as "the single failure" of his tenure, Atty. Gen. Eric H. Holder Jr. said in a televised interview.

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"The gun lobby simply won, you know?" Holder said in an interview with MSNBC's Melissa Harris-Perry which aired Sunday. In the interview, Holder reflected on his more than six years as the nation's top law enforcement officer.

Gun-control group moves to curb illegal Internet gun sales

Michael Muskal

The Internet has changed the way everyone shops by making goods and services far more accessible to far more people. That is often an acceptable thing, except when it comes to the hotly debated area of gun control.

The Internet has changed the way everyone shops by making goods and services far more accessible to far more people. That is often an acceptable thing, except when it comes to the hotly debated area of gun control. ( Michael Muskal )

Holder has called his visit to the site of the December 2012 massacre of 20 first-graders and six educators the worst day he had in office. In the aftermath of the shooting, President Obama appointed Vice President Joe Biden to lead a task force that would make recommendations for how to avoid such tragedies.