Attorney General William Barr’s removal of Geoffrey Berman from his job as Manhattan U.S. Attorney over the weekend rattled the leadership ranks at one of the most prestigious prosecutor’s offices in the country and could test relations between the Justice Department and Capitol Hill.

Mr. Barr late Friday said Mr. Berman would be stepping down—which was news to Mr. Berman, who refused. He resigned on Saturday, after Mr. Barr told him President Trump had fired him.

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