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

The liberal pro-Israel advocacy group’s ads denouncing incumbents in Iowa and Pennsylvania put it at odds with the larger organization for the first time.

Two major Republican super PACs are said to be withdrawing cash from the races of the incumbent Representatives Thomas H. Kean Jr. of New Jersey and Mariannette Miller-Meeks of Iowa in an effort to triage the midterm map.

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