Tensions have flared between Dr. Abdul El-Sayed, the Democratic Senate nominee in Michigan, and his former primary rival. “I don’t want any distractions,” Dr. El-Sayed said Saturday.

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Dr. Abdul El-Sayed and Representative Haley Stevens traded sharply critical comments Friday, escalating intraparty tensions in Michigan’s pivotal Senate race.

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His close margin of victory may point to challenges ahead.

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