WASHINGTON — Amy Berman Jackson is no stranger to working under pressure.

As a federal prosecutor three decades ago, she was in the final hours of a momentous murder trial when prospective jurors for her next trial — an armed robbery case against three defendants — showed up in the same courthouse.

Rather than delay that case, she broke away from the murder trial long enough to pick the jury for it. Then she returned to deliver her closing argument against the murder defendant. And while those jurors weighed their verdict, she delivered her opening statement about why the armed robbery defendants should be convicted.

All before lunch.

Now a federal judge in Washington, Ms. Jackson faces another high-stakes morning on Thursday when she sentences Roger J. Stone Jr., President Trump’s longtime friend and former campaign adviser, for obstructing a congressional investigation.

Mr. Trump and his allies have already denounced Mr. Stone’s prosecution as a vendetta and attacked Judge Jackson as biased, and the case is at the center of a Justice Department storm over fears of political interference. The invective is only likely to grow should she send Mr. Stone to prison, as expected.