In the run-up to the historic ruling, each party is crafting a game-plan. 

House Speaker John Boehner this past week cautioned the GOP ranks against "spiking" the ball if the mandate is struck down. He and other Republicans say the party will remain focused on repealing whatever parts of the law remain following the upcoming ruling. And, they say, they'll pursue "step-by-step" reforms to replace the law no matter the court's decision. 

Lawmakers will be dealing with plenty of other matters this week. In addition to Monday's decision reining in Arizona on its immigration law, the House could vote to hold Attorney General Eric Holder in contempt. On health care, they're trying to game out all scenarios.