Trump is scheduled to announce he is supporting the latest iteration of the First Step Act, a measure his son-in-law and senior adviser, Jared Kushner, has been working to craft and build support for alongside a bipartisan group of senators, the sources said. The President will be joined by supporters of the legislation during the White House event, the sources said.

Supporters of the measure expect that Trump’s explicit backing will help propel the prison and sentencing overhaul bill through Congress, a push White House officials hope to accomplish during the lame duck session of Congress.

The President has wavered on whether to throw his support behind the bill in recent months, but the sources said he was swayed to back the bill on Tuesday after meeting with Kushner.