Who knew that, if I only spent 10% more for everything, government expenditures would fall? [snort]
You're not going to spend 10% for "everything", only imports. And it's not going to necessarily be 10%, it's going to be whatever it needs to be to get the country back to full employment and restore our industries.
And yes, if we put Americans back to work, we will spend a lot less supporting them. Or maybe you think it's cheap to support 100 million Americans on food stamps.