The Supreme Court has heard arguments about the inclusion of a citizenship question on the next U.S. Census:

NEW- Supreme Court census argument has concluded: the conservative majority appears untroubled by Trump administration's bid to add a citizenship question — Lawrence Hurley (@lawrencehurley) April 23, 2019

Pres. Trump's top administration lawyer clashes with liberal justices of the Supreme Court over the administration's plan to add a citizenship question to the 2020 census: https://t.co/lbmTdqBSiU — ABC News (@ABC) April 24, 2019

While the Court’s decision is pending, former AG Eric Holder seems to recognize the gravity of the situation (for Democrats anyway):

These are the stakes. The citizenship question should not be on the 2020 Census – make the process accurate and fair. This IS a very big deal. https://t.co/QJxXz8lMQU — Eric Holder (@EricHolder) April 24, 2019

Is it as big of a deal as a U.S. Attorney General getting found in contempt of Congress? Probably much bigger as far as Holder’s concerned.

How can Census "process" be accurate and fair withOUT the citizenship question? — vanest (@vanest) April 24, 2019

I love the smell of panic in the late afternoon — Status Quotacus? (@brogthefrog) April 24, 2019

It’s possible we ain’t seen nuthin’ yet!