The U.S. Justice Department has appointed Joseph DiGenova, a conservative attorney who previously represented President Trump's campaign, to lead an ongoing criminal investigation into former CIA Director John Brennan.

DiGenova, who played a role in efforts to challenge the 2020 election results, will oversee the probe according to multiple reports. The appointment places a former Trump ally in charge of investigating a frequent critic of the former president.

According to reports, DiGenova is expected to divide his time between Miami and Fort Pierce, Florida, where a grand jury is reportedly examining matters related to the case. The grand jury is overseen by a judge who has been viewed favorably by Trump.

The investigation into Brennan, who served as CIA Director under President Obama and has been a vocal critic of Trump, represents a significant development in ongoing Justice Department probes. Brennan has frequently appeared on television and social media criticizing Trump's policies and conduct.

The appointment comes amid broader scrutiny of how the Justice Department handles politically sensitive investigations. DiGenova's selection has drawn attention given his previous work challenging election results and his role as a Trump campaign attorney.

Details about the specific nature of the investigation into Brennan have not been publicly disclosed by the Justice Department, which typically does not comment on ongoing criminal matters.