WASHINGTON, D.C. - Ohio Democratic Sen. Sherrod Brown, who has repeatedly called for legislation to expand background checks for firearm sales in the wake of recent mass shootings in Dayton and El Paso, now wants the nation’s largest retailer to stop selling firearms.

In a statement posted Wednesday on Twitter, Brown said he’s joining calls for Walmart to halt firearm sales. He has previously criticized online retailers including Amazon and eBay for allowing sales of gun products on their sites that their stated company policies ban.

Twenty people were killed Aug. 3 during a shooting at an El Paso, Texas, Walmart. A few days earlier, a disgruntled Walmart employee shot and killed two co-workers at a store in Southaven, Mississippi. Several days later, a man was arrested for causing panic after he dressed in body armor and carried a military-style rifle into a Springfield, Missouri, Walmart to test his Second Amendment rights.

The incidents prompted some of the chain’s employees to petition WalMart CEO Doug McMillon to stop selling firearms and ammunition, ban the public open and concealed carry of weapons in stores and on company property, and to stop political donations to NRA backed politicians. Nearly 130,000 people have signed the petition.

Democratic presidential candidates Elizabeth Warren, Cory Booker, Bernie Sanders, and Julian Castro also publicly asked the retail giant to stop selling guns after the mass shootings.

Walmart spokesman Randy Hargrove said the company is evaluating its latest experiences to find ways it can enhance safety and has not yet made any policy changes.

He pointed to past statements from McMillon which noted the company last year raised its age limit for gun purchases from 18 to 21. It stopped selling military-style semi-automatic rifles in 2015, and doesn’t sell any firearms without government approved background checks. It stopped selling handguns in every state but Alaska in the mid 1990s, and secures all firearms in a locking case with individual locks.

McMillon estimated the company currently sells about two percent of firearms and 20 percent of ammunition in the United States.

“We are a learning organization, and, as you can imagine, we will work to understand the many important issues that arise from El Paso and Southaven, as well as those that have been raised in the broader national discussion around gun violence,” said an Aug. 7 statement from McMillon. " “We will be thoughtful and deliberate in our responses, and we will act in a way that reflects the best values and ideals of our company, with a focus on serving the needs of our customers, associates and communities.”

Dick’s Sporting Goods is reportedly examining whether to cease firearm sales.