WASHINGTON (AP) — The top federal prosecutor in Miami who had been tasked with overseeing an investigation into foes of President Donald Trump has resigned, joining other high-profile Justice Department officials departing in the wake of the midterm elections, officials said Friday.

Jason Reding Quiñones’ resignation follows frustrations among Washington officials with his management of the office assigned to lead the so-called “grand conspiracy” investigation, according to people familiar with the matter who spoke on the condition of anonymity to discuss personnel issues.

The Justice Department’s top national security official, John Eisenberg, also resigned on Friday, Attorney General Todd Blanche said. On Thursday, Assistant Attorney General Harmeet Dhillon, who led a radical overhaul of the department’s Civil Rights Division, also announced her departure.

Quiñones was confirmed by the Senate last year as U.S.…