Obama said the move was part of his larger attempt to reform the criminal justice system, including reviewing sentencing laws and reducing punishments for non-violent crimes.

“I believe that at its heart, America is a nation of second chances, and I believe these folks deserve their second chance,” Obama said in the video.

The move brings the number of Obama’s commutations to nearly 90. Most of those have been for federal prisoners incarcerated for drug offenses, who under current sentencing guidelines would have already finished serving time in prison.

The White House on Monday posted a letter Obama wrote to one of the prisoners whose sentence was commuted.

“I am granting your application because you have demonstrated the potential to turn your life around,” Obama wrote. “Now it is up to you to make the most of this opportunity. It will not be easy, and you will confront many who doubt people with criminal records can change. Perhaps even you are unsure of how you will adjust to your new circumstances. But remember that you have the capacity to make good choices.”

Later this week, Obama is expected to discuss his plans for criminal justice reform further. He travels Tuesday to Philadelphia to speak at the annual convention of the NAACP, and on Thursday will become the first president to visit a federal prison when he tours to El Reno facility in Oklahoma.

“Over the last few years a lot of people have become aware of the inequities in the criminal justice system,” Obama said in the video. “Right now, with our overall crime rate and incarceration rate both falling, we’re at a moment when some good people in both parties, Republicans and Democrats and folks all across the country, are coming up with ideas to to make the system work smarter and better.”