Justice Department lawyers have improperly used requests for overseas evidence to buy more time to bring some fraud cases, a memo filed with the agency’s internal watchdog alleges.

The document, filed Friday and reviewed by The Wall Street Journal, accuses prosecutors of sending such a request to the U.K. when they already had access to similar information. It also says prosecutors delayed following up with their British counterparts, which, according to the author, former federal prosecutor Ankush Khardori, showed they didn’t…

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