Here is the latest Iowa news from The Associated Press at 3:50 a.m. CDT

DAVENPORT, Iowa (AP) — A day after floodwaters broke through a temporary barrier in downtown Davenport, Iowa, cities downstream along the Mississippi river that have remained largely dry are preparing for a flood threat that could stretch into the summer. The river is expected to reach rare heights in Missouri, including at the cities of St. Louis, Louisiana and Clarksville, and officials are scrambling to get ahead of the worst of it.

DES MOINES, Iowa (AP) — Iowa Gov. Kim Reynolds has signed a bill that creates a system for children needing help with mental health issues. Speaking at a ceremony Wednesday, Reynolds said the new law requires core services for children, regional crisis stabilization, mobile response teams, 24-hour hotline access to services, and $1.2 million for home and community-based children’s mental health services. The goal is to eliminate the waiting list that currently exists.

DES MOINES, Iowa (AP) — Iowa Sen. Charles Grassley says Congress won’t consider a new trade deal with Mexico and Canada until President Donald Trump lifts tariffs that have prompted other countries to take actions that have hurt U.S. farmers. Speaking Wednesday on a call with reporters, Grassley said Trump must end steel and aluminum tariffs before Congress will ratify a United States-Mexico-Canada trade agreement. Grassley says tariffs also could hinder efforts at a trade deal with China..

DES MOINES, Iowa (AP) — An Iowa jury has acquitted a black political campaign worker who was arrested after refusing to identify himself to police in a Des Moines suburb. Keilon Hill was canvassing in West Des Moines last October when two officers tried to stop and talk to him after a resident called 911 to report a suspicious person. Hill says he believes his skin color played a role. He was found not guilty Tuesday of misdemeanor harassment of a public official or employee.