The NYPD and other law enforcement officials are concerned over a move by the House to change the law when it comes to concealed guns.
A measure known as the Concealed Carry Reciprocity Act of 2017, would require states to recognize concealed gun carry permits from other states.
That includes New York, which currently does not recognize other states' gun laws.
Some of the city's top law enforcement officials say this could endanger public safety.
"Under this bill, one could purchase multiple handguns in any state where one lived or had a residency," said Manhattan DA Cy Vance. "And if they were lawfully possessed in that state, bring them here into Manhattan, into Times Square. They're going to be a million people here in about three weeks, and that would be perfectly legal even if it was against New York state law."
The legislation now heads to the Senate.