Lindsey Halligan at the end of an interview outside of the White House, on August 20. Jacquelyn Martin/AP

The criminal cases against two of the president’s fervent political adversaries face a critical test Thursday, as attorneys for former FBI Director James Comey and New York Attorney General Letitia James argue in court that the prosecutor who single-handedly brought their charges is unlawfully serving in her post.

The argument has put a target on Lindsey Halligan, President Donald Trump’s handpicked interim US Attorney for the Eastern District of Virginia who was tapped for the job days after her predecessor was ousted for resisting bringing charges against James related to a mortgage fraud investigation.

If the judge concludes that Halligan’s appointment is invalid, the decisio

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