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 KerryCongress, Trump need a united front to face down Iran One year ago today we declared ISIS atrocities as genocide Trump’s realism toward Iran is stabilizing force for Middle East MORE (D-Mass.) and John McCainJohn McCainMcCain says he hasn't met with Trump since inauguration Overnight Defense: General warns State Department cuts would hurt military | Bergdahl lawyers appeal Trump motion | Senators demand action after nude photo scandal Senate lawmakers eye hearing next week for Air Force secretary: report 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 CoburnDon't be fooled: Carper and Norton don't fight for DC Coburn: Trump's tweets aren't presidential The road ahead for America’s highways MORE (R-Okla.), Mike CrapoMike CrapoSenators 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 Senate Banking panel seeks proposals for economic growth MORE (R-Idaho) and Jeanne Shaheen Jeanne ShaheenOvernight Finance: Senators spar over Wall Street at SEC pick's hearing | New CBO score for ObamaCare bill | Agency signs off on Trump DC hotel lease Senators demand Pentagon action after nude photo scandal Senate Dems: We won't help pass additional health bills MORE (D-N.H.).