Revisions are common due to the BLS's methodology. The BLS makes estimates based on initial survey data, then produces better numbers based on additional data as it comes in. The methodology is publicized here: https://www.bls.gov/opub/hom/jlt/home.htm.

Trump does not like these numbers and has decided that he'd rather try to blame the messenger rather than accept this as a sign of a weakening economy. It also gives him an opportunity to install someone who might actually fudge the numbers by changing the methodology employed.

Good luck, folks.