Washington (CNN) Attorney General Jeff Sessions reversed course on suspending a legal advice program for undocumented immigrants, saying he has ordered the resumption of the program pending a review of its effectiveness.

Sessions announced the move at the opening of a hearing before the Senate Appropriations subcommittee that funds the Justice Department, saying he made the decision at the request of Congress, which has consistently appropriated money for the program.

At issue is the Legal Orientation Program, created under President George W. Bush in 2003. Unlike in the criminal justice system, immigrants are allowed to have legal counsel but the government is not obligated to provide it, so many undocumented immigrants have no legal help as they argue their case to stay in the US. The program is administered through outside groups and works with nonprofit organizations to provide immigrants with presentations, workshop sessions and referrals to potential pro bono legal services.

Earlier this month the Justice Department decided to suspend the program as it conducted a review. A 2012 audit by the department found, consistent with previous studies, that the program actually reduced the length of immigration court cases and detention, saving the government nearly $18 million.

Sessions told the subcommittee on Wednesday that while he has "previously expressed some concerns about the program," he heard from bipartisan members of the committee that led him to reverse course.

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