The most likely way I see them trying to span the gap will be removing the cap for social security tax collection, but capping how much can be paid out relative to your total retirement savings.
Basically increasing revenues by "taxing the rich" while quietly telling those with the retirement accounts to sustain them to pound sand on collecting what they planned to.
Notably, Social Security and Medicare both pay out more than their recipients paid into them (hugely so nominally, and still significantly so when you adjust for inflation).
One way to “fairly” resolve the coming 2032-2035 adjustment in Social Security would be to cut benefits first to people who have already received more money than they paid in (we won’t do this because it would zero out the Social Security payments of a lot of low-income very elderly people).