US President Donald Trump (C) delivers a statement at the White House in Washington D.C., the United States, Jan. 8, 2020. Photo:Xinhua

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 on 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."

He dismissed the worries however as "thinly veiled protectionism."

These are "very difficult issues with Europe and they will be very difficult issues with the United Kingdom. Also I'm hopeful ... that we'll work our way through them."

Lighthizer claimed that the US "has the best agriculture in the world" as well as "the safest, highest standards."

He said agriculture had been at the center of all recent trade negotiations and was "a huge, huge winner" for Americans in the new US-Mexico-Canada free trade agreement (USMCA), and also in agreements reached with China and Japan.

With Britain, however, "we will have agricultural problems" in negotiations, Lighthizer warned.

Lighthizer vowed that there would be no compromise regarding US agricultural exports.

"We either have a fair access for agriculture or won't have to deal with either one of them," he said.

US-EU trade talks have been stalled for months, locked in disputes over subsidies to Boeing, Airbus and digital taxation as well as agriculture.

AFP