Former Mayor Michael Bloomberg plans to spend $50 million this year to build a grass-roots network to challenge the National Rifle Association and seek stricter gun control laws.
Bloomberg tells The New York Times he wants to absorb the groups he funds - Mayors Against Illegal Guns and Moms Demand Action for Gun Sense in America - under an umbrella group called Everytown for Gun Safety.
He says the strategy will focus on expanding the background check system for gun buyers at the state and national levels.
The group will focus on 15 states, including pro-gun territories like Texas and where gun control initiatives have advanced.
It has set a goal of signing up one million new supporters this year.
The NRA declined to comment.