The president visited Sioux City, part of deep-red Western Iowa, in an effort to boost GOP turnout in a state that was once solidly Republican.

© Alex Kent/The New York Times

The Trump administration’s policies could cost Republicans in a state that is being hit hard by expensive diesel prices and uncertainty over trade.

Senator Katie Britt of Alabama was the latest national Republican to visit Iowa to campaign for Representative Ashley Hinson. President Trump will follow on Thursday.

© Bayliss Wagner/The New York Times

We assess three campaign ads in the battleground states that have focused on the cost of living.

© Alex Kent/The New York Times