President Obama reiterated his support for key changes to entitlement programs in a spirited exchange with House Republicans on Wednesday.

Emerging from the second day of meetings with lawmakers of both chambers and political parties, Obama deemed the exchange with his leading political nemeses "useful."

“It was good, I enjoyed it, it was useful," he told reporters as he left a basement conference room of the U.S. Capitol and headed back to the White House.

Lawmakers said the president's support for changing entitlements included possibly means-testing expensive retiree health programs and adjusting the way inflation is measured, which would have the result of reducing Social Security benefits over time.