John Legend is no stranger when it comes to using his celebrity status to bring awareness to social and political issues. And in a recent open letter to President Barack Obama, the singer has one request that could help thousands of prisoners.

In addition to the recent sentences President Obama has already commuted, Legend is asking him to commute the sentences of thousands of nonviolent drug offenders.

““Before you leave office, I would like to add my voice to the more than 2 million Americans who have asked you to use your clemency and pardon powers to bring justice to the thousands of families of nonviolent drug offenders who have waited far too long for Congress to act,” wrote Legend.

“I urge you to consider issuing categorical commutations to bring an end to the injustice that remains in our federal sentencing schemes,” Legend wrote in the letter published by Rolling Stone. “For example, approximately 5,000 individuals are serving sentences based on prejudiced laws which punished drug crimes involving crack cocaine more severely than crimes involving powder cocaine. Rectifying these crack-powder disparities would not only correct the mistakes of the past, but could save taxpayers just over $150 million per year and keep with public sentiment about the over-incarceration and criminalization of drug crimes.”