Abdul El-Sayed accused Mike Rogers of being overly devoted to President Trump. Mr. Rogers accused Dr. El-Sayed of not enough loyalty to the country. It was still more cordial than their last debate.

The ruling largely blocked homeland security agents from carrying out field interviews in nine states, including California, as part of a sprawling effort to find noncitizens registered to vote.

The latest rift with President Volodymyr Zelensky of Ukraine serves as a reminder that President Trump readily lashes out at other world leaders, only to grow outraged if they fight back.