The program requires inspections of U.S. catfish and requires non-U.S. catfish to be subject to an equivalent food-safety regiment before it can be imported. These requirements were put in place at the behest of U.S. catfish producers who were facing competition from Asia.

The House Republican agriculture bill would eliminate funding for the program, just as FSIS has put forward a proposed rule for implementing the inspection system. The rule was released in February, and FSIS was accepting public comments on its proposal through late June.

Republican and Democratic House members from Mississippi, Louisiana and Alabama can expected to argue against the bill for this reason, but are likely to face arguments that the program should be struck down as unnecessary.

In March, a bipartisan group of six senators argued that the program should be eliminated because it would hurt Vietnam's exports. Two of these senators — Sens. John KerryJohn KerryEllison comments on Obama criticized as 'a stupid thing to say' 'Can you hear me now?' Trump team voices credible threat of force Obama to attend Pittsburgh Steelers owner's funeral MORE (D-Mass.) and John McCainJohn McCainKasich: 'I think political parties are on their way out' Five fights for Trump’s first year Trump wall faces skepticism on border MORE (R-Ariz.) have strong interests in the economic development of Vietnam.

"The rule is likely to capture Vietnamese pangasius, which would shift these catfish products from the Food and Drug Administration (FDA)'s jurisdiction to USDA," their letter said. "Vietnamese companies would be forced to put into place processes the USDA deems 'equivalent' rather than use the FDA hazard analysis and critical control points system. That would impose an effective short and medium term ban on imports and a long term unnecessary new cost on imported catfish."

Other signatories to the Senate letter were Scott Brown (R-Mass.), Tom CoburnTom CoburnFreedom Caucus saved Paul Ryan's job: GOP has promises to keep Don't be fooled: Carper and Norton don't fight for DC Coburn: Trump's tweets aren't presidential MORE (R-Okla.), Mike CrapoMike CrapoLawmakers call for pilot program to test for energy sector vulnerabilities Senators war over Wall Street during hearing for Trump's SEC pick Overnight Finance: Biz groups endorse Trump's Labor pick | New CBO score coming before health bill vote | Lawmakers push back on public broadcasting cuts MORE (R-Idaho) and Jeanne Shaheen Jeanne ShaheenRussian interference looms over European elections Restore funding to United Nations Population Fund Senators urge Tillerson to meet with Russian opposition activists MORE (D-N.H.).