DES MOINES, Iowa (AP) — The Trump administration overpaid corn farmers by about $3 billion in federal aid in 2019 and farmers in the South were paid more for the same crops than those elsewhere in the country, a federal watchdog agency has found. The Government Accountability Office said in a report released Monday that international disputes resulting from tariffs imposed by President Donald Trump hurt farmers but that the U.S. Department of Agriculture’s county-by-county methodology for computing the extent of damage was flawed, leading to overpayment....