How the 2020 Census Is Being Rigged
citylab.com
citylab.com
In fact, the citizenship question was present in some form in every census from 1890 on (except in 1960 only, "country of birth" was asked instead). From 1970, citizenship continued to be asked in the long-form questionnaires.
In 2010, when Democrats controlled both Congress and the Presidency, the Census omitted the long form altogether, instead doing only the ACS (American Community Survey).
So, the plan to return to the long form survey and the inclusion of the citizenship question in it is absolutely consistent with the past 130 years of precedent; 2010 was the exception.