The interest comes from general revenue, just like all govt expenditures on interest on the debt. Interest has nothing to do with drawing down the trust fund.
Not starting, I've been clear about all the above every time you bring this up again.
Totally separate issue. You claimed that the trust fund is being drawn down. AFAIK, that won't start until next year. You claimed that when that happens, the govt has to make up for it out of general revenues. That is false too. As explained many times now, the Treasury just redeems SS Trust Fund securities and sells new ones to investors to replace it. It's swapping one debt instrument for another.
Do we have to go through this again too? Where were you when shyster Trump and the Republicans were passing their reckless tax cut? We didn't hear you objecting then, that it would add to the debt, that it's wrong, that we can't keep kicking the can down the road. On the other hand I was here pointing it out.