In their broadest assault yet against the charges, lawyers for the defendants pointed to the unusual investigative tactics the administration deployed to make the case against them.
Demonstrators disrupted a church service at Cities Church in St. Paul, Minn., in January to protest the dual roles of one of its pastors, who also serves as an acting field director for Immigration and Customs Enforcement.
The subpoena of Daniel C. Richman is the latest move in a persistent campaign to go after James B. Comey, one of President Trump’s most reviled political adversaries who has already been indicted twice.
Most sex crimes are prosecuted by state and local authorities. The federal agents appeared to be using civil rights statutes to scrutinize Mr. Swalwell’s conduct, a person familiar with the case said.
A possible expert witness was hurried off a video feed after an emergency alert in Dubai, near the Strait of Hormuz, a flashpoint in the U.S.-Iran war.
The J. Edgar Hoover F.B.I. Building in Washington last year. An imposing symbol of the F.B.I.’s vast federal powers when it opened in 1974, the building has long been deteriorating.
The government said it could not prove that a man accused of threatening federal agents had committed a crime, adding to the scores of cases in the administration’s deportation efforts that have unraveled.
On Jan. 14, after a U.S. Immigration and Customs Enforcement agent shot a Venezuelan migrant following a high-speed chase in Minneapolis, protesters broke into a couple of vehicles that belonged to F.B.I. agents.
A group of Cuban men in Mexico was charged with smuggling people to the United States. One of its leaders said Raúl Castro’s grandson helped, according to interviews and court records.