In immigration adviser for Donald Trump is reportedly in the process of drafting a proposal for a registration system for all immigrants from Muslim countries.

Kansas Secretary of State Kris Kobach — who is rumored to be in the running for attorney general — confirmed that Trump’s policy advisers are discussing implementing the Muslim registry in the future.

In the past, Trump has spoken about creating a plan to register all Muslim immigrants, although politicians from both sides of the isle have vehemently opposed the idea.

The Muslim registration would give Muslims a unique form of identification that specifies their religion. According to Donald Trump, this is a crucial aspect of his “extreme vetting” of Muslims.

During George W. Bush’s presidency, Kobach helped design a similar program in response to 9/11. However, the system was abandoned in 2011 because critics felt it unfairly targeted immigrants.

Although Trump and his team believe this is a necessary step ensure national security, people on Twitter are drawing the parallels between his system and the Jewish registration system implemented by Hitler.