US trade talks with the European Union and Britain have stalled in part due to suspicions of poor American food standards, Washington’s chief negotiator said Wednesday. “I think there’s a desire to make things work through, but for whatever reason we haven’t made much headway,” US Trade Representative Robert Lighthizer told lawmakers on Capitol Hill. “There is a sense in Europe, which I think is shared — hopefully not as deeply with (Britain) as it is with Europe — that American food is unsafe.”