Absolutely necessary to achieve what he has set out to do - yes.
Make the world safer for Russia?
If you say so.
National debt is not the end of the world.
Except when there is a Democratic Party president.
Then it spells doom for the country.
Mind you, I do also recognize that this is a variation from your usual "he's just beginning" fable, suggesting Trump actually has a plan to get the deficit, let alone the debt, under control. Good that you seem to have realized he has no such plan.
And while the national debt is not, inherently, the end of the world, as it increases
and as the rate of inflation picks up, the burden it puts on the government increases exponentially with it - pushing each year's deficit that much higher and the whole debt that much more expensive to pay for.