Republican candidate Chris McGowan and Democratic candidate Dave Dawson will meet face-to-face for a debate Wednesday as they seek the U.S. House seat in Iowa's 4th Congressional District.

The U.S. Department of Justice has threatened California with possible legal action over what it says are noncitizens believed to have received mail ballots for next month's midterm elections.

Chemical fertilizers and animal waste contain nitrates and phosphorus that can get washed with rain or snowmelt into the state's rivers. That affects Iowa's more liberal urban centers which rely on rivers and lakes for drinking water.

The shifting money in the final weeks of midterm campaigns points to a defensive posture by Republicans and new aggression from Democrats, who aim to capitalize on President Donald Trump's weak approval ratings.

President Donald Trump's midterm roadshow to rally the GOP is stopping Wednesday in swing-state Arizona and a Republican-leaning U.S. House district in Montana.

Democratic leader Hakeem Jeffries said Democrats will be united on reinstating Affordable Care Act tax breaks, reversing Republican Medicaid cuts, holding votes against the Iran war and undoing President Donald Trump's tariff regime.