NEW YORK (AP) — Walmart will require customers to wear face coverings at all of its namesake and Sam’s Club stores, making it the largest retailer to introduce such a policy that has otherwise proven difficult to enforce without state and federal requirements.

The company said the policy will go into effect on Monday to allow time to inform stores and customers. The Bentonville, Arkansas-based company said that currently about 65% its more than 5,000 stores and clubs are located in areas where there is already some form of government mandate on face coverings.

The retailer also said it will create the role of health ambassador at its Walmart stores and will station them near the entrance to remind customers without masks of its new requirements. These workers, who will be wearing black polo shirts, will receive special training to “help make the process as smooth as possible for customers.”

The moves come as new COVID-19 cases are spiking in many states, particularly Arizona, California, Florida and Texas. Retailers have been challenged with striking a balance between keeping shoppers safe while making them feel comfortable.

Last week, the Retail Industry Leaders Association, which represents Walmart, Best Buy and other major chains, publicized a letter it sent to state governors to mandate store customers to wear face coverings. It said the hodgepodge of rules around the country have created confusion for shoppers and that has led to conflict between customers and workers trying to enforce store rules.

The National Governors Association said last week that its members are discussing the letter and others like it from different retail groups.

Social media is full of videos capturing clashes between those who are asked to wear masks, and employees who are under orders to make sure people wear them.

Fewer than half of U.S. states require masks in public places, according to the RILA. And only a handful of major retailers including teen clothing chain American Eagle Outfitters has a mask mandate for customers for all of its stores. Costco Wholesale Club was one of the first major retailers to require face coverings for customers at all of its stores. The policy went into effect in early May.

“We know some people have differing opinions on this topic,” wrote Dacona Smith, chief operating officer at Walmart U.S. and Lance de la Rosa, chief operating officer at Sam’s Club in a blog posted Wednesday. “We also recognize the role we can play to help protect the health and well-being of the communities we serve by following the evolving guidance of health officials like the CDC.”

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