The U.S. government can strip a naturalized immigrant of their citizenship if they are criminally convicted of naturalization fraud or if the government proves through civil proceedings that they illegally obtained their citizenship through fraud or misrepresented or concealed facts on their application.

A recently unveiled memo from the Department of Justice indicates Donald Trump’s administration plans to “maximally pursue” denaturalization of American citizens, marking a radical expansion of the president’s anti-immigration agenda.

In a memo the Department of Justice said it will prioritize denaturalization of US citizens on any grounds it consider important. Here's what it said

The lawsuit is targeting Ordinance Number 188441, which prohibits city resources, including personnel, from being used for immigration enforcement.