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 Forbes KerryBringing the American election experience to Democratic Republic of the Congo Some Dems sizzle, others see their stock fall on road to 2020 The Hill's 12:30 Report MORE (D-Mass.) and John McCainJohn Sidney McCainSenate's defense authorization would set cyber doctrine Senate Dems hold floor talk-a-thon against latest ObamaCare repeal bill Overnight Defense: Senate passes 0B defense bill | 3,000 US troops heading to Afghanistan | Two more Navy officials fired over ship collisions 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 Coburn-trillion debt puts US fiscal house on very shaky ground Al Franken: 'I make fun of the people who deserved it' The more complex the tax code, the more the wealthy benefit MORE (R-Okla.), Mike CrapoMichael (Mike) Dean CrapoSenate Banking panel approves Trump's Fed, comptroller nominees Harvey damage adds urgency to flood insurance debate Don't let funding for US Forest Service go up in flames MORE (R-Idaho) and Jeanne ShaheenCynthia (Jeanne) Jeanne ShaheenWeek ahead: Crunch time for defense bill’s cyber reforms | Equifax under scrutiny Five things to know about the Kaspersky-Russia controversy DHS bans Kaspersky software in federal agencies MORE (D-N.H.).