In 2020, everyone in America will be asked to fill out a census questionnaire. Census.gov writes:

“As mandated by the U.S. Constitution, our nation gets just one chance each decade to count its population. The U.S. census counts every resident in the United States… The data collected by the census determine the number of seats each state has in the U.S. House of Representatives (a process called apportionment) and is also used to distribute billions in federal funds to local communities.’

With all that in mind, Last Week Tonight’s John Oliver took a look at why the census matters and why next year may bring a bigger undercount than usual:

“The 2020 census is likely to be even more challenging than usual from reasons like budget shortfalls to active Republican meddling.”

Another thing looming over the 2020 census is Donald Trump’s attempt to add a citizenship question. The Supreme Court ruled against Trump on this and the president eventually backed away from the threat of an executive order to add the question. But Oliver points out, “The damage might already be done… They’ve now created an environment of fear, people will still be looking over their shoulder terrified.”

“There is a lot working against this census and experts worry an undercount next year is inevitable. The only question is by how much and the fear is it could be millions. So what can we do? It’s actually relatively simple. All of us living in America now need to fill out the census next year.”

Oliver says if you are on the fence about whether to participate in the census do it to irritate Donald Trump:

“Because think about it, his administration already clearly thinks that some people don’t count. So there’s no better way to get back at him (Trump) than to make sure that you do and make the census count you.” 

Watch the full segment above.