Two more senior figures have left the United States Justice Department in the wake of the Democratic midterm victory, extending an exodus of Trump aligned officials.

Attorney General Todd Blanche said Jason Reding Quinones, the US attorney for the Southern District of Florida, submitted his resignation on Friday. Quinones had overseen and expanded a federal probe into Russia's alleged role around the 2016 election, a case Trump has long cast as a political witch hunt even after a special investigator found no direct collusion with his campaign. Critics say the department pursued politically charged investigations at the president's urging.

The Florida office's work reportedly included subpoenas aimed at former intelligence chiefs, though no charges followed from that line of inquiry. Separately, former FBI director James Comey has faced charging efforts that he calls an abuse of the department. Quinones also oversaw the indictment of elderly Cuban revolutionary Raul Castro as part of a wider pressure campaign on Havana. Blanche praised his record on violent crime, trafficking and transnational cases.

On the same day John Eisenberg, assistant attorney general for the national security division, also resigned. Blanche said he had strengthened the response to foreign and domestic threats. The departures follow the exit of Harmeet Dhillon, who led the civil rights division and faced fierce criticism over its direction.

The wave of resignations lands as Trump officials prepare for Democrat led oversight once the new Congress convenes. Control of the House and Senate will give Democrats subpoena power, and several inquiries are expected to focus on alleged politicisation of the Justice Department.