This article at the link below is a very good explanation of Social Security and how it works. I urge you to read the full article to avoid being mislead by the rhetoric that will be coming at us in the months ahead.
The excerpt below refers the depletion of the Trust.
Two claims about SS are that Congress stole the money and that SS has no impact on federal deficits.
Congress used the funds generated by the Trust buying treasury bonds when there was excess payroll tax revenue. Congress does that with all bonds that are sold.
Now that those bonds must be redeemed, Congress must come up with the cash to give to the Trust. Below is how that can be accomplished. I’ll leave it to you to decide if there can be any impact on the federal deficit.
This means that beginning in 2021 when Social Security starts redeeming Treasury bond holdings in the trust funds to pay scheduled benefits, the government will have to borrow from the public, raise taxes or cut spending to finance those redemptions.