The GOP plan, crafted by House Budget Committee Chairman Paul RyanPaul Davis RyanSpending deal talks down to toughest issues, lawmakers say Schiff: I thought more Republicans would speak out against Trump Dem leaders pull back from hard-line immigration demand MORE (R-Wis.), would cut $5.8 trillion in spending over 10 years and transform Medicare into a sort of voucher system, among other measures, to balance the budget by 2040 without raising taxes.  

Widespread opposition among Senate Democrats, and at least one Republican, ensures that the budget proposal, whenever it comes up for a vote, will not pass in its current form. 

Nonetheless, Reid promised late last month that he would allow Republicans to have a vote on the plan.

“Republicans seem to be in love with the Ryan budget, so they will have a chance to vote on it," Reid said.

In the meantime, there are few signs of exactly when a Democratic alternative might emerge.