The prospect of a U.S.-U.K. trade deal may fill President Donald Trump with excitement — but some Brits are calling “fowl” over the risk their supermarkets will be flooded with chlorine-washed chicken.

With the Brexit talks sputtering away, the U.K. government is looking to strike trade deals outside the European Union to shore up any gaps. One target is the U.S. — but a dispute over food safety could put a kibosh on any pact.

In the U.S., chicken carcasses are rinsed in chlorine at the end of the production process to get rid of harmful bacteria. The EU takes a different approach: It lays down high standards of hygiene on farms and in slaughterhouses to avoid contamination, rather than clean it up later.

Right now, Britain holds fast to these EU rules, which also ban the import of chlorinated birds. For the country to seal a quick trade deal with its American cousins, those bars would likely have to be lifted — and that prospect is rattling quite a few cages in the U.K.

Cutting back on regulations would be a “a race to the bottom for welfare standards,” a committee from parliament’s House of Lords said in a Brexit-related report released Tuesday.

But it looks like game on for a U.K.-U.S. deal, after Trump tweeted Tuesday that his administration is working on a “very big & exciting” trade agreement with Britain.

And International Trade Secretary Liam Fox, on a U.K. schmooze mission to Washington, wouldn’t rule out opening the door to chlorine-rinsed poultry if needed to seal a trade pact, according to media reports.

“I’m not going to get into hypotheticals,” Fox said.

Environmental campaigners then challenged the keen Brexiteer to put his mouth where his mouth is.

“If the International Trade Secretary wants the public to trust him, he needs to take the opportunity while he’s in the U.S. and devour a chlorine-washed chicken live on camera,” said Open Britain’s executive director, James McGrory, according to The Independent.