(CNN) The Department of Justice asked senior managers to compile a list outlining how important functions would be affected if the partial government shutdown were to persist into March, according to law enforcement officials.

One official said managers at component agencies were ordered to complete a memo by the end of Thursday and include a detailed look at the wide-ranging effects a shutdown would have if it continues to drag on for more than another month.

The memo was to include the impact on the agency's many investigations, including the ability to conduct wiretaps and pay informants, one law enforcement official said.

Kerri Kupec, a Justice spokeswoman, declined to comment.

A senior Office of Management and Budget official told CNN, "prudent management means planning and preparing for events without known end dates. As OMB continues to manage this partial lapse in appropriations, unfunded agencies are being asked to continue to share with OMB an ongoing list of programs that could be impacted within the coming weeks."

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