In today’s newsletter: The U.S. and Iran trade attacks in the latest escalation since agreeing to a ceasefire. Democratic incumbents are at risk of losing their seats as they face strong challengers. And why shoppers paying in cash are bearing the brunt of credit card fees. Here’s what to know today. The U.S. military said it carried out what it called self-defense strikes on Iranian radar and drone control sites over the weekend, while Tehran said it targeted an air base used in the U.S.