The Justice Department has issued subpoenas in a criminal inquiry involving Representative Ilhan Omar, a Minnesota Democrat.
The investigation centers on the immigration history of Omar and her family, according to sources familiar with the matter.
Federal prosecutors have accelerated the probe after several years of preliminary examination.
The subpoenas signal a more aggressive phase in the long-running inquiry, which had moved slowly until recently.
Details about the scope of the subpoenas and their recipients remain unclear. The Justice Department has not commented publicly.
Omar has previously denied any wrongdoing related to her immigration records. She has called past scrutiny politically motivated.
The case adds to a broader pattern of federal investigations targeting elected officials in recent years.
No charges have been filed, and the inquiry may not result in any. The investigation continues.
