It’s not like the Republican Party’s members of Congress haven’t had time. They’ve had six whole years to consider how they would replace the Affordable Care Act if they ever got the chance to repeal the law.

They seem set on the repeal part of the ACA. What, though, is taking them so long to come up with the replacement?

The ACA — aka Obamacare — is President Obama’s signature domestic achievement. He’s no doubt going to speak highly of it when he bids the nation farewell in just a little while.

The ACA has enabled about 20 million Americans to obtain health insurance. Has it been “affordable,” as the president pitched it? Not entirely. Premiums have gone up; medical plans have had trouble marrying up doctors and health insurance companies.

It is not, as the GOP has maintained for the past six years, a “disaster.” They seem to dislike it mainly because a Democratic president came up with the idea of providing insurance for uninsured Americans.

But hey! He got the idea from Massachusetts, which had a Republican governor — a guy named Mitt Romney — that had developed a nearly identical plan. Obama copied Romney’s plan, more or less, and adapted to the national model.

What’s more the president himself has said that he would have been willing to accept an alternative if it did a better job than the ACA. Republicans, though, aren’t ready to provide an alternative.

What in the world has taken them so long? Are they content only to bitch and moan for the sake of political expediency without giving serious thought and discussion to how they would replace the ACA?

They’ve got the repeal part down pat. How about giving us something with which to replace it? If they intend to govern, they need to flesh out the details of how their ideas on health care are better than what we have.