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Barr's comment came at a news conference to discuss last year's shooting at a U.S. military base in Pensacola, Florida. A reporter asked about Trump suggesting publicly in recent weeks that top officials in the Obama administration, including the former president, had committed crimes.
While noting he was not taking aim at Trump's comments specifically, Barr lambasted what he called the "increasing attempts to use the criminal justice system as a political weapon."
"The legal tactic has been to gin up allegations of criminality by one's political opponents based on the flimsiest of legal theories," Barr said. "This is not a good development."
He then specifically dismissed the idea that Connecticut U.S. Attorney John Durham - who has been examining how the FBI handled the 2016 investigation into possible coordination between the Trump campaign and Russia to influence the election - would look at Obama or Biden.
"As to President Obama and Vice President Biden, whatever their level of involvement, based on the information I have today, I don't expect Mr. Durham's work will lead to a criminal investigation of either man," Barr said. "Our concern over potential criminality is focused on others."
He declined to say who Durham was focused on.
Trump and his allies have begun suggesting Obama and other top officials in his administration broke the law during the Russia investigation - a conspiracy theory they have dubbed "Obamagate" - particularly in their treatment of former Trump national security adviser Michael Flynn. Barr's comments seem to suggest, though, that he does not want the U.S. law enforcement apparatus to be drawn in to another political squabble.
"We cannot allow this process to be hijacked by efforts to drum up criminal investigations of either candidate," Barr said, referring to Trump and Biden, Trump's presumptive Democratic opponent.
Barr has in the past sought to publicly warn Trump about getting too involved in Justice Department business. In February, for example, he went on ABC News to declare Trump's tweets about Justice Department business "make it impossible for me to do my job," and the attorney general privately told people close to Trump he had considered resigning over the matter. Barr also issued formal guidance to the Justice Department earlier this year that any investigations of presidential candidates first need his approval.
In recent weeks, Trump has seized on developments in the Flynn case to turn his attention to Obama and Biden. At Jensen's recommendation, the Justice Department moved to undo Flynn's guilty plea to lying to the FBI about his conversations with a Russian diplomat.
U.S. District Judge Emmet Sullivan is considering that matter and has appointed a retired federal judge to oppose the Justice Department's position. Trump told Fox News that he had "read legal scholars" and they "can't believe" what Sullivan was doing to Flynn.
On the same day of the Justice Department's move to drop Flynn's case, Trump's top intelligence adviser, Richard Grenell, visited the Justice Department to deliver a list - which he had just declassified - of former Obama administration officials including Biden, who made requests during the presidential transition that would ultimately "unmask" Flynn's name in National Security Agency files.
There is nothing wrong with such requests: Unmasking is a routine practice used to identify U.S. individuals who are referred to anonymously in intelligence documents, and it is meant to help government officials better understand what they are reading. But Trump and his supporters seized on the documents to allege wrongdoing.
Trump last week urged Senate Judiciary Committee Chairman Lindsey Graham, R-S.C., to call Obama to testify about what he dubbed "the biggest political crime and scandal in the history of the USA." Graham cast doubt on whether that would be a good idea.
Trump has been unable to articulate what crime he thinks has been committed.
"You know what the crime is," he told a reporter who pressed him for details last week.
Even as Barr said Durham would not likely investigate Obama and Biden, he seemed to add fuel to some of Trump's long-standing attacks on the Russia investigation, asserting that law enforcement and intelligence officials were involved in "a false and utterly baseless Russian collusion narrative against the president."
"It was a grave injustice, and it was unprecedented in American history," Barr said.
But, referencing the recent Supreme Court decision to overturn the convictions of two of former New Jersey governor Chris Christie's political allies in the "Bridgegate" case, Barr asserted, "there's a difference between an abuse of power and a federal crime."
"It cannot be and it will not be a tit-for-tat exercise," Barr said.
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