Ed O'Callaghan

Career Early in his career, O'Callaghan was an assistant U.S. attorney in the U.S. Attorney's Office for the Southern District of New York. He was co-chief of the office's terrorism and national security unit.

Sarah Palin "truth squad"

In 2008, O'Callaghan became a lawyer for the presidential campaign of Republican John McCain. His two co-leaders were Karl Rove protégée Brian Jones, and Washington lawyer Mark Paoletta. Paoletta, Jones, and O'Callaghan were "tasked specifically with responding to the sort of viral attacks that have been popping up about Palin's background and record in Alaska... The public face for this pushback, though, will be woman Republican politicians, a 'truth squad' team designed to highlight attacks on Palin and draw sympathy to her side." Paoletta and Jones were volunteers while O'Callaghan was on staff.

O'Callaghan was sent to Alaska to handle "legal issues that are affecting the political dynamic of the campaign," according to Taylor Griffin, a former Treasury Department official in the Bush administration. Newsweek described O'Callaghan's role as "helping to direct an aggressive legal strategy aimed at shutting down a pre-election ethics investigation" into Palin." Working with Palin's attorney Thomas Van Flein, O'Callaghan worked to block the investigation, telling reporters, "There was no Ethics Act violation and there is no need to go forward with this."

The Alaska Personnel Board concluded that Palin did not violate the Alaska Executive Ethics Act by trying to get her brother-in-law fired. Alaska Personnel Board investigations are normally secret, but the three-member board chose to release its report one day before the presidential election.

Private practice O'Callaghan moved into private practice in March 2009, joining the law firm Nixon Peabody as part of its Government Investigations and White Collar Defense Practice Group. In 2011, he joined the law firm Clifford Chance in New York as a Partner in its White Collar, Regulatory Enforcement and Government Investigations practice group. O'Callaghan worked on several high-profile cases; he represented Achilles Macris, who was head of the London branch of JPMorgan Chase's chief investment office, where the trader nicknamed the "London Whale" operated. O'Callaghan also served on the defense of Jeffrey Webb, the former President of CONCACAF and member of the FIFA Council, in the criminal RICO indictment pending in the United States District Court for the Eastern District of New York.

Justice Department tenure during Trump administration In 2017, O'Callaghan became the principal deputy assistant attorney general of the Justice Department's National Security Division.

Geoffrey S. Berman, who was U.S. Attorney for the Southern District of New York from 2018 to 2020, wrote in his 2022 memoirs that, throughout his two and a half years as U.S. attorney, officials in Trump's Justice Department, including O'Callaghan, repeatedly attempted to interfere with the office to politically benefit Trump, and that these officials "kept demanding that I use my office to aid them politically." Berman wrote that U.S. Attorney's Office for the Southern District of New York (USAO-SDNY) had come under a level of political pressure from Trump officials that was "unprecedented and scary," and that he rebuffed these requests until June 2020, when—angered by USAO-SDNY's investigations into Trump allies Michael Cohen and Rudy Giuliani—Trump fired him. O'Callaghan denied making the statements. The nine-page memo, dated March 24, 2019, was co-written with another senior Trump DOJ official, Assistant Attorney General Steven Engel. O'Callaghan and Engel asserted that the evidence uncovered by the special counsel investigation led by Robert Mueller was insufficient to support a case for obstruction against Trump. DOJ initially kept the memo secret.