Mr. McMillon spent Tuesday in El Paso, Texas, meeting with Walmart employees who worked at the store where 22 people were killed in Saturday's attack. In addition to the petition, organizers in San Bruno, Calif. and Portland, Ore., where two Walmart e-commerce offices are located, are urging employees to walk out on Monday at 3 p.m. local time if their requests fall on deaf ears and the company continues to donate to "politicians who receive funding from the National Rifle Association".
Earlier this week, Walmart (WMT) told Reuters there had been no change in its policy on gun sales after the recent mass shootings, one of which took place in a Walmart store.
He accused Walmart of retaliating against him and Kesner by shutting down their company email and Slack accounts on Tuesday, after they sent a division-wide email to roughly 20,000 e-commerce employees urging to join their efforts.
Walmart's steps are not good enough for a lot of critics including Senator and Democratic presidential candidate Elizabeth Warren, who tweeted on Friday that the retailer should "do the right thing - stop selling guns". "Walmart has a reputation for silencing dissent".
He said the walkouts would feature a moment of silence for the victims of the shootings. "There has been no discipline, and we're not going to speculate on that further".
Walmart has more than 4,000 stores in the US alone.
In June, hundreds of Wayfair employees walked out to protest the sale of $200,000 worth of furniture to a Texas detention center that houses migrant children. Some Walmart employees have voiced their concerns about the store's gun sales.
Ariana Grande performs surprise duet with Barbra Streisand
Streisand teased the duet-to-come on Monday, posting a photo of her and Grande's just manicured fingernails. She wrote, "cherishing this moment forever".
The company has come under increasing pressure to act in the past few days.
Spokespeople for the company say there was no significant activity in response to the call for a walkout.
Mr. Marshall said he still didn't have access to the internal system as of Wednesday morning.
With 1.5 million workers, Walmart is the nation's largest employer, according to The Washington Post. Previous year the company raised the minimum age to buy a gun to 21 from 18 after the mass shooting at a high school in Parkland, Florida.
On Tuesday, chief executive Doug McMillon said in an Instagram post that the company will "work to understand the many important issues arising from El Paso and Southaven as well as those raised in the broader national discussion around gun violence".
"They said they will be thoughtful and careful about their response, so we are respectful of that..."
"Last year, Walmart raised the minimum age to buy a firearm or ammunition from 18 to 21 and removed products resembling assault-style rifles from its inventory".