President Trump yesterday touted his repeal of key Clean Water Act regulations as more than three dozen current and former government officials called for an investigation into the scientific basis of his forthcoming replacement rule.

Trump told a gathering of the country’s farmers that last fall he repealed “one of the most ridiculous regulations of all,” the Obama administration’s Waters of the U.S., or WOTUS, rule, which defined which marshes, creeks and streams quality for federal protections.