Budget for a Better America: Mid-Session Review, Fiscal Year 2020 Budget of the U.S. Government [open pdf - 6MB]
From the Summary: "The Mid-Session Review (MSR) updates the Administration's estimates for outlays, receipts, and the deficit for economic, legislative, and other changes that have occurred since the President's 2020 Budget was released in March. The 2019 deficit has been revised to a projected $1.0 trillion, $91 billion lower than the $1.1 trillion deficit projected in March. The improvement in the 2019 deficit is largely the result of technical revisions, including an increase in expected receipts based on new tax reporting data and collections to date, as well as a decrease in outlays, primarily in mandatory and net interest spending."
White House: http://www.whitehouse.gov/