The unexpected resignation of Census director John H. Thompson was likely related to the administration providing only half the requested budget for 2017. Mona Chalabi for The Guardian on why this matters:
Budget cuts at the Census Bureau mean counting fewer things. Fair enough right? Except that the subjects that are being targeted for cuts seem conspicuous. So far, the Trump administration has deleted questions on sexual orientation from the 2020 Census and at least two other government surveys. Meanwhile, two Republican-sponsored bills introduced in January say that government money can’t be used to collect data on “racial disparities”.