Democrats said they, too, were eager to stanch deficits that now exceed $1 trillion annually. But they said it needed to be done in a more balanced way, with rich and poor alike sharing the load.
The GOP plan envisions repeal of the president's health care overhaul and sets a course for deep reductions for highway and rail projects, research and aid to college students and farmers, while easing planned defense cuts.
It also would cut taxes by $2 trillion more than the president's plan over that time, leaving Republicans seeking about $3.3 trillion in deeper deficit reduction than Obama.
Drawing the most political heat was Ryan's plan for Medicare, the $500 billion-a-year health insurance program for older Americans that all sides agree is growing so fast its future financing is shaky. Both parties know that seniors vote in high numbers and care passionately about the program.
Republicans would leave the plan alone for retirees and those near retirement, letting the government continue paying much of their doctors' and hospital bills.
For younger people, Medicare would be reshaped into a voucher-like system in which the government would subsidize people's health care costs. Republicans say that would drive down federal costs by giving seniors a menu of options that compete with each other. Democrats say government payments won't keep up with the rapid inflation of medical costs, leaving many beneficiaries struggling to afford the care they need.