Some of New York City's district attorneys went to Washington on Wednesday to protest a new gun bill on the same day the bill passed a House of Representatives committee.

"The Concealed Carry Reciprocity Act would be, I think, the single most destructive bill we could pass to affect the public safety we have achieved, and affect it negatively," said Manhattan District Attorney Cy Vance. "Individuals could come in with loaded weapons into New York City, and probably hundreds of thousands when you consider we have 46 million visitors outside the United States into New York."

The bill would require all 50 states to recognize concealed carry permits — meaning someone who bought a weapon outside of New York's borders could legally bring it into the city.

The DAs met with lawmakers and expressed their opposition to the bill, which they argue would make the city more dangerous.

The bill has the support from groups such as the National Rifle Association (NRA).

The GOP hopes the bill goes to the House Floor for a vote before the end of the year.

Wednesday, a House committee sent the bill to the House floor. A vote is expected before the end of the year.

Passing the bill is a priority for the NRA. Gun control advocates and Democrats are against it, and even some Republicans.

"It violates, really, conservative principles. We're supposed to believe in local control — city, state governments deciding what's best for their state — not having people from another state passing laws which can impact us," said New York Rep. Pete King, a Republican.

A huge concern: the safety of police officers.

"In my position, I care," NYPD First Deputy Commissioner Benjamin Tucker said. "These are my cops, and I don't want them to be placed in further jeopardy unnecessarily."

The North Carolina congressman who introduced the bill says people who do not know the laws of other states get in trouble when they're caught with guns in other jurisdictions.

That reasoning was not enough for Vance. "You wouldn't want New York's laws to have to apply to you; we don't want your laws to have to apply to us," the district attorney said.

The bill will likely pass the House, but it will face tougher opposition in the Senate, as Democratic votes are needed for it to move forward.