The Justice Department has opened an investigation into former House representative Eric Swalwell, a Democrat who had also been running for California governor, over allegations of sexual misconduct, according to a source familiar with the matter.

The nature of the department’s investigation into Swalwell is not immediately clear, but it comes as several women have come forward over the past week, accusing the California Democrat of sexual assault or other forms of misconduct, prompting scrutiny at both the federal and local levels. Prosecutors in Los Angeles and Manhattan have also launched separate investigations into the allegations.