The debate over this year's budget is over. Next up: an even more contentious battle over raising the debt ceiling.
For this fight, President Barack Obama's strategy is three-fold. 

First, warn of catastrophic consequences if the debt ceiling isn't raised by early July when the Treasury Department runs out of fiscal tricks to keep from breaching the limit. 

Second, demand a "clean" debt ceiling increase, unencumbered by the tough spending and deficit caps that some congressional Republicans want to strap on the measure. Finally, blame the GOP for holding our economy hostage as often as possible.

In the background is the S&P downgrade of its outlook for U.S. debt, and the Federal Reserve's winding down of its second round of quantitative easing (QE2). Both raise the possibility of instability in bond markets and higher interest rates. And just as QE2 goosed stock prices, the end of the program could have the opposite effect.

Democrats are already preparing to use this backdrop to pressure the GOP into letting Mr. Obama continue his wild spending. Rep. Sander Levin (D., Mich.), like Mr. Obama, voted against raising the debt ceiling in 2006. But the ranking Democrat on the House Ways and Means Committee said Monday that the S&P announcement sends a "very clear" signal to Republicans not to "play games with the debt ceiling." Calling for a clean debt ceiling, Vermont's Democratic Rep. Peter Welch lambasted House Majority Leader Eric Cantor on Monday, saying if he "persists in playing politics with the debt limit" then "he will be held accountable for unleashing the financial hounds of hell." And Treasury Secretary Timothy Geithner warned that those who think they "can take this to the brink" are "going to own the responsibility for the risk that creates for the American economy."

The GOP needs to push back now—thoughtfully and aggressively. Yet in conversations with Senate and House Republicans, I was amazed to find they weren't talking to each other. Though the Senate and House GOP leadership may be, congressional Republicans need to settle on a common negotiating posture sooner rather than later.

Karl Rove is the former senior adviser and deputy chief of staff to President George W. Bush. He is a Fox News contributor and author of "Courage and Consequence" (Threshold Editions, 2010). To continue reading his column in The Wall Street Journal on Republicans and the debt ceiling debate, click here

Karl Rove joined Fox News Channel as a political contributor in February 2008. He also currently serves as a columnist for the Wall Street Journal. Mr. Rove helped organize the political-action committee American Crossroads. His latest book is "The Triumph of William McKinley: Why the Election of 1896 Still Matters" (Simon & Schuster, 2015). Follow him on Twitter @KarlRove.