Second Amendment sanctuary
A Second Amendment sanctuary, also known as a gun sanctuary, is a state, county, or locality in the United States that has adopted laws or resolutions to prohibit or impede the enforcement of certain gun control measures which are perceived to violate the Second Amendment, such as Universal background checks, high capacity magazine bans, assault weapon bans, red flag laws, etc. Although other jurisdictions had previously adopted legislation now characterized as creating Second Amendment sanctuaries, the Carroll County, Maryland Board of Commissioners is thought to be the first body to explicitly use the term "sanctuary" in its resolution on May 22, 2013 and Effingham County, Illinois County Board is thought to have popularized the term on April 16, 2018.
Source: Wikipedia — Second Amendment sanctuary (CC BY-SA 4.0)