U.S. President Bill Clinton Thursday called on Congress again to quickly pass the gun control legislation and suggested that measures included in legislation could prevent tragedies such as the killing of a 6-year-old girl last week.

"I'm not at all sure that even a callous, irresponsible drug dealer with a 6-year-old in the house wouldn't leave a child trigger lock on a gun," Clinton said in an interview with CNN.

Kayla Rolland was killed by her first-grade classmate, a 6-year-old boy, at a school in Mount Morris Township of Michigan State on February 29.

Clinton repeated his call for licensing gun owners and said that in the future, trigger locks could be retrofitted for old handguns.

"If I could pass this, then I'd start looking at what to do with the guns that are out there now, whether we could get trigger locks for them and how we'd do it," he said.

On Tuesday, Clinton met with key House and Senate judiciary committee leaders in the White House, but the meeting failed to yield an agreement to resume negotiations over a gun bill.

U.S. House and Senate conferees have not met since last August, unable to bridge differences over the gun show provision.