I get what he's saying a big part of the reason the deficit has grown is corporate tax cuts. I just disagree with the notion that the entire deficit is because of that like there are no other factors in a deficit, like spending, amongst others. If my wife told me were losing money every month, there are few options maybe we should cut spending, maybe I need more income, maybe both, or we could ignore it. So to me claiming the whole thing is simply the income went down is maybe partially true, military spending saw a 27B increase from 2017 to 2018, and will like rise again. Seems to me Congress and the President have mostly chosen to ignore the deficit, continue to spend (and spend even more) which raises the deficit and give tax cuts to the wealthy and big businesses which also raises the deficit. Spending is supposed to increase by 16 percent between 2017 and 2020, seems reduced spending to help the deficit has been ruled out. To be honest one of the reasons I have not seen eye to eye with the Dems so far in the primaries is most of them want to enact a bunch more government spending, at least they want to tax everyone a bunch more to compensate.
Now what's hilarious is that Trump said he was going to lower / eliminate the deficit, and so far it's done nothing but go up under him, but that seems somewhat expected.