Clinton and the Republicans in Congress recently have avoided a "legislative train wreck, " including a budget deadlock and partial government shutdown, but some Republicans are still concerned about whether they can work with congressional Democrats and the White House to pass important legislation this year.
Ryan, the conservative House Budget Committee chairman from Wisconsin, has proposed a partial privatization of the entitlement that would provide government subsidies to help senior citizens pay for coverage they would choose from a list of options.
In the absence of a budget accord, there's a possibility of a third partial government shutdown starting January 27, when a temporary funding measure expires.