WASHINGTON, D.C. — Amid “alarms about national security,” the head of the federal office investigating a controversial visa-investor program used by Terry McAuliffe’s company is now himself under congressional investigation.

Charles Edwards, interim inspector general of the Department of Homeland Security, faces allegations of misconduct, including misusing official resources and exerting undue influence.

Republican and Democrat lawmakers on the Senate Homeland Security and Government Affairs Committee have demanded his resignation or firing.