According to several sources, a handful of centrist GOP lawmakers attending a recent Tuesday Group luncheon erupted when Budget Committee Chairman Paul Ryan (R-Wis.) and House Majority Whip Kevin McCarthy (R-Calif.) broke the news.

After agreeing to write a budget resolution that will balance the budget over the next decade, Ryan conceded that he might have to adjust the age to as high as 59.

“Paul Ryan was pretty clear that that could happen. You could have to take it up to a higher number like 56, 57, 59 … it could be higher than 55, but he also said, ‘We don’t have any numbers yet,’ ” said a Republican lawmaker who attended the meeting…

“A lot of people had made commitments at 55. In other words, in the campaign [Republican vulnerable members] said it wouldn’t affect your Medicare for retirees or near retirees for those 55 and up … and [if] this budget forces them to renege on that, that would be problematic for many,” said the GOP lawmaker, who spoke on the condition of anonymity.