Little more than a month after they backed sweeping changes to Medicare, Republicans are on the political defensive, losing a House seat long in their possession and exhibiting significant internal strains for the first time since last fall's election gains.
Key lawmakers are considering reductions in support for federal workers' pensions as they search for cuts that can clear the way for an increase in the national debt limit.
Congress sent President Barack Obama hard-fought legislation cutting a record $38 billion from federal spending on Thursday, bestowing bipartisan support on the first major compromise between the White House and newly empowered Republicans in Congress.
In a post-election reversal, House Republicans are supporting nearly $450 billion in Medicare cuts that they criticized vigorously last fall when Democrats and President Barack Obama passed them as part of their controversial health care law.