(Bloomberg) — Senate Republicans unveiled a spending plan Wednesday that sets up a confrontation between their party's defense and budget hawks and omits a politically polarizing Medicare overhaul championed by Representative Paul Ryan.

The first Senate budget proposal authored by Republicans since 2006 calls for $430 billion in unspecified savings from Medicare, the health care program for seniors, as part of a plan to trim $5.1 trillion in spending and balance the budget in 10 years without raising taxes. It doesn't include partially privatizing Medicare as does the House plan put forth Tuesday.

Another difference that will make it difficult to reconcile the two chambers' budget plans is that the Senate proposal contains $58 billion in war funding, which President Barack Obama requested for next year, in contrast to the $94 billion House Republicans want.