Republican leaders are struggling to sell a bill to repeal the Affordable Care Act on the stump in 2018.

The latest efforts by House Speaker Paul Ryan and Majority Leader Kevin McCarthy have failed to garner much attention from voters, as GOP primary voters are mostly undecided about their preferred candidate.

And Republicans are scrambling to keep their seats in states like Texas and Georgia, which have both seen a spike in the number of babies born with rare congenital heart disease.

If the House passes its health care bill this week, which it would have to do in a special conference committee, the Senate is expected to take up the measure in its own conference next week.

The House has not yet passed its health bill and it’s not clear what the Senate might do.

So it’s up to the House and the Senate to come up with a unified bill to replace the ACA.

Here’s what you need to know about the Republican health bill.