Republicans and Democrats square off in court Monday in a high-stakes battle over the fate of California's Proposition 50, which reconfigures the state's congressional districts and could ultimately help determine which party controls the U.

Republicans are staring down a major health care challenge as Affordable Care Act (ACA) subsidies are set to expire at the end of the month. With a two-week recess beginning Dec. 22, they only have this week to get the issue resolved.