A week after February’s deadly school shooting in Parkland, Fla., Walmart Inc. executives huddled inside the company’s headquarters to discuss how they should sell guns.

President Donald Trump tweeted support for raising the minimum age to buy guns to 21. Florida Republicans voiced similar wishes. Walmart executives knew the company, one of the country’s largest sellers of guns, could be ensnared in the debate, one executive said, and they worried about a potential patchwork of state laws. Publicly, the company stayed quiet.