Appearing on “Fox News Sunday,” Representative Paul Ryan opened up a new front in the budget wars.  He said that House Republicans are planning to propose a reduction in excess of $4 trillion over the next decade by reshaping popular programs like Medicare.  The plan, expected to be released tomorrow, begins to set the terms of a debate for the 2012 election, and moves beyond the short-term debate of trimming billions to a long-term debate of trimming trillions.  In the short term, a government shutdown could come as early as Saturday, though lawmakers are saying they expect a budget deal to emerge by then.  President Obama on Saturday said Democrats and Republicans have agreed to a dollar amount in cuts.  Speaker Boehner quickly refuted that claim saying that there is no deal, and that he will continue to push for the largest possible spending cuts.