Im sure he wants voter data to be added so he can target Democrats. The NYT recently published an opinion piece by Roger Edsall called Trump is not afraid of a Civil War. Neither is Stephen Miller. He quoted Miller from his speech at Kirks funeral.
At the memorial service for Charlie Kirk last month in Phoenix, Stephen Miller, Trumps top domestic policy adviser, described in great detail how the administration plans to deal with its domestic opponents: We will not live in fear, but you will live in exile, because the power of law enforcement under President Trumps leadership will be used to find you, will be used to take away your money, take away your power, and if you have broken the law, to take away your freedom.
We Democrats are the domestic opponents, and just because we disagree with and criticize Trumps policies, they plan to keep records on us (through government databases and the voter data they have demanded), use our data to take away our money and power (for example by outlawing ActBlue and other Democratic organizations), and then create false crimes to prosecute and imprison us. If that is not fascism, I dont know what is. Miller is talking about replicating the Stasi of East Germany and having the government exert total control over citizens who do not worship at Trumps feet.