The Department of Justice is moving to strip the citizenship of hundreds of foreign-born Americans, referring cases to U.S. attorneys that target naturalized citizens.

“The Department of Justice is laser-focused on rooting out criminal aliens defrauding the naturalization process,” Matthew Tragesser, DOJ’s deputy director for communications, said in a statement to The Hill. “Under the leadership of President Trump and Acting Attorney General Todd Blanche, the department is pursuing the highest volume of denaturalization referrals in history, thanks to close partnerships” with immigration agencies.

“We are moving at warp speed to ensure fraudsters are held accountable and prosecuted to the fullest extent. Our filed referrals in one year have exceeded the total during the entire four years of the Biden administration, with many more to come,” Tragesser added.

The New York Times reported the DOJ is targeting 384 foreign-born Americans whose citizenship the Trump administration wants to revoke. The Justice Department is now assigning denaturalization cases to prosecutors in many U.S. attorney’s offices across the country rather than through attorneys specializing in immigration.

Stripping a naturalized foreign-born American of their citizenship has been rare; it is typically only done when someone committed fraud in pursuit of their U.S. citizenship, or if they committed disqualifying crimes, such as national security threats or other serious felonies.

The DOJ pursued just 305 denaturalization cases between 1990 and 2017 — an average of 11 cases a year.

The new DOJ action is part of a broader push of the Trump administration’s crackdown on immigration that has flooded some major U.S. cities with federal agents and ramped up removals of people in the country illegally.