The U.S. Justice Department will widen the criteria it uses to decide which drug offenders to recommend to the president for clemency, Attorney General Eric Holder said on Monday.

The department expects thousands of convicts serving time for drug offenses to be eligible for reduced sentences under the new clemency guidelines and it will prepare to review an influx of applications, Holder said in a video address.

Under U.S. law, the president can reduce sentences or pardon Americans serving sentences for federal crimes. The Justice Department will now recommend more candidates for the president's consideration.

Details of the new criteria will be announced later this week by Deputy Attorney General James Cole.

Holder hinted the guidelines may include applying a 2010 law that reduced sentences for crack cocaine offenders to those sentenced before the law was enacted.

"There are still too many people in federal prison who were sentenced under the old regime and who, as a result, will have to spend far more time in prison than they would if sentenced today for exactly the same crime," Holder said in his address.