The department cited national security concerns, saying Elon Musk’s company had played a crucial role in the Iran war. It also argued it has the authority to stop environmental lawsuits brought by citizens.

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A gunman believed he was defending the crowd, then killed an innocent protester. The legal case is complicated.

© Kim Raff for The New York Times

The F.B.I. director, following a strategy from President Trump, has filed six defamation lawsuits against news media companies and commentators in nearly seven years.

© Tierney L. Cross/The New York Times