The National Rifle Association (NRA) and other gun rights advocates are assailing Democrats for a controversial legislative proposal that they say would restrict access to handguns.

People would be required to obtain a license before purchasing some firearms under the Handgun Purchaser Licensing Act, which was introduced Thursday by Rep. Chris Van Hollen (D-Md.) and a trio of Connecticut lawmakers.

The legislation also seeks to expand background checks to all handgun sales and block people under the age of 21 from purchasing those firearms.