Joe Biden knows as well as anyone that nothing moves the radical right more than the immigration issue. He has done what he can, within the limits of simple humanity, not to provoke them. Since no legislative solution to the immigration problem is in sight, even though the framework of such a deal is only too obvious, he is kicking the can down the road. The solution will have to wait for another day.
On Afghanistan, on the other hand, Biden rejected the kick the can “solution” and withdrew the troops knowing that defeat, chaos, and unpopularity were likely to follow. That raises the question: is the debt ceiling issue more like immigration or Afghanistan?
I think it is somewhere in between. My guess is that Biden will take a deal with cosmetic cuts if he can get one, but he won’t give in to any demands that put his legislative legacy and party unity at risk.