The Bureau of Labor Statistics last week issued a steep downward revision to May and June's hiring numbers, prompting President Trump to call the edits "miscalculations" by the department's commissioner, whom he subsequently fired, in a social media post on Aug. 1.

President Trump’s pick to run the federal agency that produces the critical U.S. jobs report might not be able to make it more reliable — and a new commissioner could even make the problems worse.