The Veterans Affairs Department is chipping away at a massive inventory of disability claims, reducing the number considered backlogged by about 15 percent in recent weeks.

Republican lawmakers are skeptical the trend will continue, but they’ve been unable to agree on a solution to a problem that has become a major headache for the Obama administration.

The VA pays disability benefits to veterans who are injured or become ill as a result of their active service. For years, veterans have complained that it takes too long for their claims to be resolved. In late March, more than 633,000 claims, or about 70 percent, were pending longer than 125 days.

But in recent months, the department has taken steps to try to deal with the backlog. The oldest claims in the system were moved to the front of the line, and claims processors were required to work at least 20 hours of overtime each month. That has helped to reduce the backlog to just more than 531,000, the VA said Thursday.

Among the claims cleared were about 65,000 cases that had been pending for longer than two years. About 2,000 such cases remain.

VA spokesman Josh Taylor said long-term changes, including moving to a new computer system, also have had an impact.

Although the progress appears to have bought the department some time on Capitol Hill, lawmakers are still looking for a long-term solution to the backlog issue.

Rep. Jeff Miller, the Republican chairman of the House Committee on Government Affairs, reiterated his calls for an independent commission to examine the root causes of the problem and more direct involvement from President Barack Obama.

“If we can’t bring collectively all the people to the table to help resolve it, I don’t see a solution out there,” Miller said Thursday at an event sponsored by Concerned Veterans for America, a political advocacy group.

But Sen. Richard Burr, the ranking Republican on the Senate Committee on Veterans’ Affairs, said he views commissions as a tool to provide the VA with more time.

“Time has run out. Now is the time we need to begin to fix it,” Burr said in an interview after his speech to the group. “I think if we set up a commission that is not charged with fixing the problem now, then all we’ve done is say, ‘We’re going to wait until 2015 to see if this works or not.’”

The backlog in claims exploded in 2010 after the VA expanded the list of illnesses presumed to have been caused by Agent Orange.

That decision pumped about 260,000 previously denied and new claims into the system and required the VA to redirect nearly a third of its disability claims workers to completing just those Agent Orange claims.

Digging deep into the data, the Center for Investigative Reporting put the problem into greater context. It found that the number of veterans waiting more than a year for their benefits grew from 11,000 in 2009 to 245,000 in December, which also happened to track Obama’s tenure in office.

Sen. Bernie Sanders, I-Vt., the chairman of the Senate Committee on Veterans’ Affairs, said some of the major veterans groups, including the Disabled American Veterans and the American Legion, have helped calm the waters on Capitol Hill. Those groups have said the department, led by VA Secretary Eric Shinseki, is moving in the right direction.

Sanders backs legislation that would put new reporting requirements on the VA to help lawmakers more closely track whether the department is meetings its goal to eliminate the claims backlog by 2015. He said he believes the proposal would have bipartisan support. However, it wouldn’t establish a commission, as favored by Republicans in the House.