(CNN) — Senate Majority Leader John Thune on Monday would not commit to a vote on a GOP health care proposal this week with key Affordable Care Act subsidies soon to expire.

Democrats are set to get a Senate vote later this week on their proposal to extend the enhanced ACA subsidies for three years without any changes. The plan – lacking enough Republican support to pass – is expected to fail but Republicans agreed to hold the vote after Democrats made it a demand to reopen the government during the record-breaking shutdown.

Republicans have long been divided over how to replace the Affordable Care Act and are weighing multiple proposals as the clock ticks down on the expiring tax credits. While some are open to letting them sunset, others are concerned that higher prices could hurt Rep

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