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NEW YORK, N.Y. -- You can count New York City Mayor Michael Bloomberg among those calling for stricter gun laws following the tragedy in Colorado.

Bloomberg noted current laws require background checks when a gun is purchased in a store, but not in a private sale. The mayor directly challenged President Barack Obama and GOP presidential candidate Mitt Romney to take a firmer stance on the issue.

"Governor Romney signed a bill in Massachusetts prohibiting the sale of assault weapons and he spoke eloquently about it. Today [Monday] he's not in favor of it. President of the United States Barack Obama campaigned four years ago on a platform of saying he was going to try to ban the sale of assault weapons and has done nothing since then," said Mayor Bloomberg.

Bloomberg also said some 48,000 Americans will be killed with illegal guns during the next president's term in office.