(Bloomberg) — The first major act of the unified Republican government in 2017 will be a vote in Congress to begin tearing down the Affordable Care Act.

But the euphoria of finally acting on a long-sought goal will quickly give way to the reality that Republicans — and President-elect Donald Trump – have no agreement thus far on how to replace coverage for about 20 million people who gained insurance under the health-care law.

"They haven't come to a consensus in the House and the Senate about the possible replacement plans," said Douglas Holtz-Eakin, a conservative economist and former adviser to Senator John McCain's 2008 presidential campaign. "They don't know Point B."