Here is the latest Iowa news from The Associated Press at 3:30 a.m. CDT

LACONA, Iowa (AP) — Cracks are appearing in President Donald Trump’s support from Midwest farmers. His trade war with China has already scrambled global grain markets, but now corn farmers are up in arms over Trump’s decision to allow dozens of oil refineries to skip blending corn-based ethanol with gasoline. The head of the National Corn Growers Association, Nebraska farmer Lynn Chrisp, says frustration with Trump has boiled over. One Iowa farmer, Randy Miller, sees the ethanol waiver as a stab in the back.

NORTH SIOUX CITY, S.D. (AP) — An official with the U.S. Army Corps of Engineers says a study is needed to consider changes to flood-control measures along the Missouri River south of Sioux City, Iowa. Speaking after a U.S. Senate field hearing Wednesday in North Sioux City, South Dakota, Brig. Gen. Peter Helmlinger noted such a study could call for actions such as changing the Missouri River channel in the Sioux City area to let the river spread out and carry more water. Levees also could be rebuilt farther from the river.

CEDAR RAPIDS, Iowa (AP) — Federal prosecutors for Iowa say a former medical student who sold guns to a felon and tried to hire a hit man has been sentenced to more than seven years in prison. Officials say 36-year-old Steven Arce, of Waterloo, was sentenced Wednesday in Cedar Rapids to 90 months in federal prison. Arce admitted that he sold guns to someone he knew was a felon, and arranged with the felon to hire a hit man, who turned out to be an undercover officer.

SIOUX CITY, Iowa (AP) — A northwestern Iowa man has been charged with vehicular homicide and drunken driving in a crash last month that killed his cousin. The Sioux City Journal reports that 37-year-old Darrick Toel, of Le Mars, was arrested late Tuesday on the charges. Investigators say Toel was driving about 90 mph the night of July 1 when he lost control of his car, left the road, rolled and hit a tree. His passenger, 37-year-old Ryan Toel, of Struble, was critically injured and died two days later.