The Department of Justice is pursuing citizenship revocation cases against at least 300 foreign-born Americans as part of expanded denaturalization efforts under the Trump administration, according to a person familiar with the investigations.

The citizenship review process represents a significant expansion of denaturalization cases, which typically target individuals who allegedly obtained citizenship through fraud or other illegal means. The DOJ has not disclosed specific criteria for selecting cases or the timeline for completing reviews.

Meanwhile, law enforcement and local government officials across the United States have expressed concerns over the past year that federal immigration operations are interfering with routine police work, according to internal emails and briefings. The documents reveal worries that officers are being misidentified as Immigration and Customs Enforcement agents during community interactions.

Police departments report that the heightened immigration enforcement climate has led to increased distrust between officers and community members, potentially hampering criminal investigations and public safety efforts. Some departments have documented threats against officers who residents believe are connected to immigration enforcement.

The developments occur as the administration has implemented what officials describe as an aggressive immigration crackdown targeting both undocumented immigrants and naturalized citizens. Local law enforcement agencies have raised concerns that the federal focus on immigration is creating operational challenges for their daily policing duties.

Todd Blanche, who has been involved in immigration-related legal matters, has taken several actions that administration officials say demonstrate progress on key presidential priorities in this area.