Jordan Weissmann, writing for Slate:

Around the time Trump entered office, the CBO projected that the budget gap was on pace to hit $775 billion by this year, or 3.6 percent of the economy. Capitol Hill’s forecasters now think it will reach $1.015 trillion instead, equal to about 4.6 percent of GDP. That extra percentage point is what we should probably think of as the Trump bump. It’s a result of both the GOP’s 2017 tax bill (no, it did not pay for itself) and budget deals that have increased military as well as domestic expenditures.

You Should Be Absolutely Furious Over Donald Trump’s $1 Trillion Deficit