In Iowa's State Senate District 21, Republican John Hollinrake and current Democratic State Rep. Heather Matson seek to replace Sen. Mike Bousselot.

A bill U.S. Sen. Joni Ernst wrote to encourage domestic manufacturing was signed into law by President Donald Trump. It is called the Critical Infrastructure Manufacturing Feasibility Act. It directs the Commerce Department to examine critical products currently imported and to identify opportunities to make those items in the United States.

U.S. Sen. Joni Ernst joined Republican Senate candidate Ashley Hinson in Glenwood, urging voters to keep Iowa’s Senate seat in Republican hands as Hinson campaigned on lowering costs.

Libertarian Thomas Laehn said that he isn't running for Iowa's U.S. Senate seat to be a "spoiler" in the race.

Before the candidates take the stage, WHO 13’s Teodora Mitov will help viewers understand the people, priorities and political stakes behind Iowa’s open U.S. Senate race. The “Debate Night Iowa” pre-debate show streams Tuesday,

Outside groups have spent more than $137 million on Iowa's open U.S. Senate race this election cycle, according to a Des Moines Register analysis of campaign finance data.