During the Senate confirmation hearings when he was first appointed attorney general, Barr said he did not agree with the Supreme Court's Roe v. Wade decision and viewed abortion as an issue best left to the states, the Los Angeles Times reported at the time.
Under Bush 41, Barr was a hardliner on crime, advocating for expanding state and federal prison systems.
Sources familiar with the matter told the Post that Barr is a "really serious contender, and possibly the front-runner" for the position of attorney general.
After leaving the Justice Department, Barr served as the general counsel and executive vice president of Verizon Communications but retired from the role in 2008.
These comments were made days after a Washington Post report quoted Barr as saying the following about Clinton: "I do think that there are things that should be investigated that haven't been investigated". Barr later worked as a corporate general counsel and is now of counsel at a prominent worldwide law firm, Kirkland & Ellis LLP.
The appointment of a new attorney general would come at a precarious time as special counsel Robert Mueller's Russian Federation investigation, which the department oversees, is showing signs of entering its final stages.
Brie Larson stars in the latest Captain Marvel trailer
We did not expect this turn of events, but we enthusiastically accept the new reality where we all relate to Nick Fury . There's no official word on that yet, but we'll be willing it to be true with every fibre of our beings.
He was quoted two months later in a Post story as expressing concern that members of Mueller's team had given contributions to Democratic candidates.
George Terwilliger, who served as the No. 2 official in the Justice Department when Barr was attorney general, said Barr would bring "40 years of high level experience, both in government and in business, which gives him a perspective that fits many of this administration's priorities".
Rove noted Barr respects Mueller, who led the FBI's criminal division when the former was AG under Bush.
Barr shares at least one of the president's views on the probe being conducted by special counsel Robert S. Mueller III. "I would have liked to see him have more balance on this group", he said in July 2017. Barr was one tough lawyer.
Barr wrote that Comey "crossed a line that is fundamental to the allocation of authority in the Justice Department" in announcing the outcome of the investigation into Hillary Clinton's use of a private email server.
Senator John Cornyn of Texas, the No 2 Republican leader, agreed.