Agriculture Secretary Sonny Perdue said that a second trade aid package for farmers may total $15 billion to $20 billion, the latter figure $5 billion higher than President Donald Trump has suggested. Perdue said that USDA would calculate "the legally defensible trade damage done to our producers," give that estimate to Trump and would be "prepared to defend those amounts" to the World Trade Organization, where the United States could face charges that it has violated rules on subsidies. Perdue said he could not comment on whether the formula for providing payments to farmers would be different from the last package, in which soybean growers got $1.65 per bushel, corn growers got one cent per bushel and wheat growers got 14 cents.Perdue also said that, although Trump has talked about using a portion of tariff receipts to pay for the aid, he believes that the money will come from the Commodity Credit Corporation, as it did last time.The CCC can spend $30 billion per year, and it is not known whether the CCC is bumping up against its spending cap this late in the fiscal year, which ends Sept. 30.