There are so many things to bash his tax plan for — and you choose the national debt?
The Democrats play right into the hands of the Republicans by worrying about the deficit. The deficit is directly equal to money spent into the economy and not taken away in taxes. Until the Democrats figure this out, they will forever be stuck in a world of austerity and ever decreasing social programs, like education, for example.
Source: Why Democrats need to stop concern-trolling Trump about the deficit