Walmart, the world’s largest retailer, is working to curb the impact of tariffs that have become the weapons of choice in President Trump’s trade disputes and are pushing up Corporate America’s supply costs.

“The potential future impact is difficult to quantify,” Chief Financial Officer Brett Biggs said Thursday, after the Bentonville, Ark.-based chain reported a 4.4 percent jump in inventory costs, which reached $95.6 billion in the three months through June. “We are closely monitoring the tariff discussions and are actively working on mitigation strategies, particularly in light of potentially escalating duties.”