The whole program is a sunk cost fallacy at this point. Congress needs to look at the cost and return of fixing the F35 program versus scrapping the entire thing, which is probably the best decision it could make.
The F35 is an unmitigated disaster. It is everything a military jet SHOULDN'T be. The entire process was destined to fail from the beginning, and it all boils down to the DoD's decision processes, like those that award contracts based on the race and gender of a company's owner rather than the merit of that company's products, and the ones that say "gee, if there could only be one plane that did everything, that would definitely be the best way to go!"
Jack of all trades, master of nothing, is not what we need in a fighter. The reason we have different branches of the military is because each has starkly unique needs compared to the others. Their needs are so unique that even the most junior engineer can look at the F35 proposal and say "hahaahh fuck no."