Here is the latest Iowa news from The Associated Press at 3:40 a.m. CDT

JOHNSTON, Iowa (AP) — Democrats vying to challenge Republican Sen. Charles Grassley in his upcoming re-election race have used a televised debate in Iowa to criticize the longtime senator’s involvement in a Supreme Court nomination fight. The four candidates used the hour-long debate Thursday night in Johnston to highlight Grassley’s decision not to hold hearings for President Barack Obama’s U.S. Supreme Court pick. The debate comes shortly before Iowa’s June 7 primary.

IOWA CITY, Iowa (AP) — Attorneys who lost a malpractice case against University of Iowa Hospitals and Clinics are seeking access to a letter containing allegations of jury tampering in another case won by the hospital. Investigators are looking into allegations that the hospital benefited from jury tampering in a high-stakes February trial involving a girl who was born with brain damage and severe disabilities. Jurors found the hospital was negligent but didn’t award damages.

DYERSVILLE, Iowa (AP) — Major League Baseball Commissioner Rob Manfred has announced this year’s National Baseball Hall of Fame tour stops during a trip to the “Fields of Dreams” movie site in eastern Iowa. Manfred was joined by 2015 Hall of Fame pitcher John Smoltz in Dyersville to announce that Davenport, Iowa; Kansas City, Missouri; Milwaukee; St. Louis; Minneapolis; and Las Vegas will be host cities for this year’s “We Are Baseball” tour stops.

PITTSBURGH (AP) — A Pittsburgh man was sentenced to life in prison Thursday for killing two of his next-door neighbors, the sisters of an Iowa state lawmaker. Jurors told the Allegheny County judge Thursday that they were deadlocked on whether to impose the death penalty against 45-year-old Allen Wade. In Pennsylvania, a jury must unanimously recommend a death penalty or a life sentence is automatically imposed.