if you look at just his salary since 1990, 29 years ago, i'm sure it's at least two million dollars, after taxes.
he currently makes $174,000/yr. that number has certainly gone up since 1990, but he's also had investments, and there's also been inflation. if we take a naive - and no doubt wrong - calculation, 29*174,000 = $5,046,000. so, that's over five million dollars. all you have to do is cut that in half to account for taxes and overestimates to get to two and half million dollars.
which brings up another point that i think is more valid - should he be accepting social security payments? i think that's a more valid criticism than merely pointing at his net wealth.