Not really trying to give "them" a headache.  I don't really take sides in this political stuff; I don't consider myself to be either Republican or Democrat.  
I'm just wondering--genuinely curious--as to how somebody came up with such a massive figure.  It has to be based on some sort of projections and that's what I'd like to see.  
I am not trying to question whether the US governent is sucking money out of SS; it's been doing that since the '50's so I just assume that part is accurate (government greed combined with a naive setup for SS is largely why SS is in the state it's in to begin with).  $3 trillion is such a big figure it just sort of jumped out of the page at me.
US government's current budget is roughly $2.4 trillion, and that includes a $500 billion deficit.
J_A_B