The gun control organization backed by Michael R. Bloomberg will soon begin a national advertising campaign aimed at pressuring Republican senators to support measures that would strengthen and expand background checks for gun buyers.
The campaign by the group, Everytown for Gun Safety, comes after two mass shootings in less than a week killed eight people at spas in Georgia and 10 at a supermarket in Boulder, Colo.
The organization’s political arm plans to kick off the campaign in April with $1 million to $1.5 million in television and digital advertisements.
John Feinblatt, Everytown’s president, said the ads would target Republican senators including Patrick J. Toomey of Pennsylvania and Susan Collins of Maine, who backed the failed 2013 effort to expand background checks, along with “a number of retiring senators” who have opposed new gun control measures in the past.
Mr. Feinblatt said the campaign was aimed at securing the 60 votes needed for the Senate to pass gun control proposals that have already passed the House, which include expanding federal background checks for new gun purchases. It will not ask Democratic senators to alter the filibuster rules to pass any measure with a simple majority vote.
“Every senator needs to know how urgent this matter is, and every senator needs to know we mean business about seizing the moment and getting the bills passed,” Mr. Feinblatt said on Wednesday. “This is about getting 60 votes, which we think is entirely possible because the political calculus has changed.”
Everytown has become the biggest player in gun control politics in recent years. The organization spent about $55 million backing Democratic candidates in 2020.
Mr. Feinblatt said the campaign would continue until the Senate sent the measures to President Biden, who called on Tuesday not only for background checks but also for an assault weapons ban. Such a ban has not received a serious debate in Congress, and Mr. Bloomberg’s organization is not pushing it at the moment.
“We will stick with this until there’s a vote,” Mr. Feinblatt said. “I don’t know when that vote will take place, but I know that we will spend what it takes for as long as it takes.”