The full process to become a US citizen takes a minimum of six years. Five years of residency and holding a Green Card and if lucky one year for the citizenship application. It is not an easy process, and is very thorough. Apparently Trump feels it is not thorough enough. Now US Citizenship and Immigration Services is creating a new office to review citizenship applications, to see who lied on their form, so they can be stripped of their citizenship and deported.

My money is on naturalized Muslim, and brown-skinned people, be they Hispanic, or African, being the ones singled out for review, having their citizenship revoked, and deported.

Link 1 Transcript NPR interview with Professor Mae Ngai

Link 2 CNN

Link 3 Length of time to become US citizen

Link 4 US Govt process to become US citizen