In his new budget, President Bush will call for large cuts in the growth of Medicare, far exceeding what he proposed last year, and he will again seek major savings in Medicaid, according to administration officials and budget documents. Over all, the 2009 budget is likely to be the first $3 trillion spending request by a president. Healthcare savings are a crucial part of Mr. Bush's plan to put the nation on track to achieve a budget surplus by 2012.