Here is the latest Iowa news from The Associated Press at 3:35 a.m. CDT

DES MOINES, Iowa (AP) — Former Vice President Joe Biden and Montana Gov. Steve Bullock have opened the Iowa State Fair’s 2020 presidential blitz by blistering President Donald Trump and promising to push new gun restrictions. Biden says “everything the president’s said and done encourages white supremacists.” Bullock says Trump’s rhetoric and behavior are beneath the office he holds.

WATERLOO, Iowa (AP) — Across the early primary states, Democratic voters – who have seen a parade of more than two dozen presidential candidates march through their states for months – are starting to get exhausted with the primary field and are anxious to take on Donald Trump. Even some die-hard Democratic activists are getting restless.

EPWORTH, Iowa (AP) — State environmental officials are investigating a fish kill in a river in eastern Iowa. The Iowa Department of Natural Resources says in a news release that thousands of dead fish _ mostly rough fish and minnows _ were found Thursday along a 10-mile stretch of the Little Maquoketa River starting north of Epworth and running downstream to Durango.

SIOUX CITY, Iowa (AP) — Pressure is mounting on former Colorado Gov. John Hickenlooper to trade in his faltering presidential bid for a U.S. Senate run in his home state. But the decision will not be an easy one for the 67-year-old. Hickenlooper has repeatedly said he’s more interested in being an executive. A successful run for Senate would also take him out of the mix for potential Cabinet appointments should Democrats win the White House next year.