The great failing of the Trump presidency has been the lack of spending restraint. But increasing demands from the new Democratic majority in the House of Representatives may be inspiring the President to finally set some reasonable limits. Meanwhile there’s another significant milestone in Mr. Trump’s successful effort to restrain Washington’s production of red tape. Americans who still dream of limited government have at least some cause for hope.

As for federal spending, which is expected to surge past $4.4 trillion this...