We may never know how responsible they are. Vote by mail, who knows who really won an election?
IRS Failed to Collect $47+ Billion in Taxes from High-Income Individuals during Obama Admin
https://www.grassley.senate.gov/news/news-releases/irs-failed-collect-47-billion-taxes-high-income-individuals-during-obama-admin
Full text here:
https://www.finance.senate.gov/imo/media/doc/2020-06-04%20CEG%20letter%20to%20IRS%20(Rettig)1.pdf