President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE on Friday signed into law a bipartisan criminal justice reform bill after it overwhelmingly passed both chambers earlier this week.

The bill, called the First Step Act, reduces mandatory minimum sentences in certain instances and expands on "good time credits" for well-behaved prisoners looking for shorter sentences.

It also instructs the Department of Justice to establish a risk and needs assessment system to classify inmate's risk and provide guidance on "housing, grouping, and program assignment."

The Senate approved the bill in a vote of 87-12 on Tuesday while the House approved it 358-36 on Thursday, sending it to Trump's desk.

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The bill's passage was a significant victory for Trump and his son-in-law and senior adviser Jared Kushner Jared Corey KushnerAbraham Accords: New hope for peace in Middle East Tenants in Kushner building file lawsuit alleging dangerous living conditions Trump hosts Israel, UAE, Bahrain for historic signing MORE, who was involved in negotiations over the bill. Criminal justice reform was one of Kushner's major policy goals since arriving in the White House.

It was also a big victory for a group of GOP senators and advocates who pushed to pass the bill before the end of the year. Previous efforts to pass such reform has long stalled in the Senate.

At the bill signing ceremony on Friday, Kushner noted that "this really took an army of a lot of other people" and noted many people were drawn to the issue of criminal justice reform because of the "pain of the past."

On Thursday, Trump tweeted that the House approving the bill is "a great bi-partisan achievement for everybody. When both parties work together we can keep our Country safer. A wonderful thing for the U.S.A.!!"

When the Senate approved the bill, Trump said that First Step Act would "keep our communities safer, and provide hope and a second chance, to those who earn it. In addition to everything else, billions of dollars will be saved."

Trump's support for the bill was key last month for advocates, and he repeatedly pushed Senate GOP leadership to bring it up for a vote this month.

CNN political commentator Van Jones, a criminal justice reform advocate who has been a vocal critic of Trump on other issues, called passage of the Trump-backed bill "a Christmas miracle."