California governor calls for U.S. constitutional amendment on gun control

California Gov. Gavin Newsom on Thursday called for the country to adopt an amendment to the Constitution that would challenge the core of the Second Amendment by writing new gun controls into the government’s founding document.

He said California will lead the way in proposing a new constitutional convention to propose the amendment.

Mr. Newsom said his proposal would create a national minimum age of 21 for purchasing a firearm, would mandate “universal” background checks for gun sales, create a waiting period between purchase and pickup, and ban civilian purchases...