(CNN) — The White House has postponed its rollout of a new proposal to address health care costs aimed at averting a spike in premiums driven by the expiration of key Affordable Care Act subsidies, a White House official said.

President Donald Trump was originally expected to unveil the plan on Monday, but now that is not happening. The official did not provide a reason for the delay.

This shifting timeline comes as Trump seeks to fulfill his vow to deliver a better alternative to the enhanced ACA subsidies relied on by nearly 22 million people and comes after Democrats rejected measures to reopen the shuttered government for more than a month over their demand for a clean extension of those payments.

Senate Republicans agreed to hold a mid-December vote on extending the enhanced sub

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