Barr, who served as USA attorney general from 1991 to 1993 under President George H.W. Bush, is a well respected lawyer among Republicans, and following his time as AG served as general counsel and executive vice president of Verizon Communications.
While he has an extremely conservative record, Barr would also bring to the role seasoned experience and is well regarded in the legal community.
In a 2017 interview with The Washington Post, Barr had a critique for Special Counsel Robert Mueller, who is spearheading the Russian Federation investigation. Patrick Leahy, D-Vt., before Barr's hearing on November 12, 1991.
Regardless, Barr's confirmation process is likely to take months.
Barr also raised concerns about special counsel Mueller's appointment of prosecutors with a history of donating to Democratic candidates, telling The Washington Post in July 2017 that he "would have liked to see him have more balance on this group".
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He praised Bush as a "truly attractive human being" who had the "courage of a warrior but the greater courage of a peacemaker". And the Trumps visited members of the Bush family at the Blair House presidential guesthouse, where they are staying.
"To the extent it is not pursuing these matters, the department is abdicating its responsibility", he said.
Barr was attorney general between 1991 and 1993, serving in the Justice Department at the same Mueller oversaw the department's criminal division.
At least one other contender who has received serious consideration from the White House, according to the person, is Rep. John Ratcliffe, a Texas Republican. But Barr, made in the Republican establishment mold, is viewed as one of the safer choices for confirmation.
Attorney General nominee William Barr (center) chats with then-Sen. He expressed confidence in Mueller early on and suggested the investigation wouldn't devolve into a "witch hunt", but he also has shared some disappointment when asked by The Washington Post past year about the donations that some of Mueller's team members made to Democrats.
Barr has also written that former FBI Director James Comey was right to publicly announce, days before the 2016 election, that he was reopening an investigation of Hillary Clinton's handling of her emails as Secretary of State. Barr is now rumored to be Donald Trump's top contender to replace ousted Attorney General Jeff Sessions.
"I have worked with him for over 25 years and I believe it would be a great choice", Cullen told ABC News.
Williams said the "problem" with Barr as a pick is the question of "how would he view the Mueller probe".