During a Senate Judiciary Committee hearing on Wednesday, the father of a 6-year-old boy killed at Sandy Hook Elementary School in December said he didn't understand why anyone needed an assault weapon.

"It just breaks my heart that something like that could happen in this country," Neil Helsin said while holding a portrait of his slain son.

Heslin noted that last month at a hearing in Connecticut, he had asked why anyone needed to own an assault rifle like the one used to kill 20 children and 6 adults at Sandy Hook Elementary School. Gun rights advocates shouted "the Second Amendment" in response to his rhetorical question.

"I haven't received an answer yet, but they did blurt 'the Second Amendment,'" he said. "It wasn't about the Second Amendment. I defend the Second Amendment and I want to see that upheld and regulated. And it hasn't been."

Watch video, clipped by Talking Points Memo, below: