Congress has the authority to repeal its own laws. Think Prohibition. That was a Constitutional Amendment reversal. If they can do that, they can repeal a lower law.
If they repeal it there’s no basis to say they can’t repeal a law they passed prior.
Our system of laws is NOT the Medes and Persians, where once a law is on the books, it can’t be changed. Laws are modified and sections are taken away and replaced with NOTHING equivalent all the time.
I see; I’m not holding my breath, though. Now we get to provide free healthcare (on top of free breakfasts in public schools) to every freeloader, from anywhere around the world, who can make it across the border.
Until taxpayers start breeding again they can expect more of the same.